Terminal device, base station device, integrated circuit, and radio communication method

ABSTRACT

A terminal apparatus which performs periodic channel state information reporting to a base station apparatus, the terminal apparatus including a reception unit that receives first information, second information, and index information indicating a value for reporting periodicity of the channel state information, from the base station apparatus, and a transmission control unit that determines the value for reporting periodicity of the channel state information on the basis of the index information, in which the applicable value is based on a certain UL-DL configuration, in which, in a case where the second information is not configured, the certain UL-DL configuration is a UL-DL configuration indicated by the first information, and in which, in a case where the second information is configured, the certain UL-DL configuration is a UL-DL configuration indicated by the second information. Consequently, in a radio communication system which employs dynamic TDD, interference with a downlink signal is avoided, and an uplink control signal is transmitted.

TECHNICAL FIELD

The present invention relates to a terminal apparatus, a base stationapparatus, an integrated circuit, and a radio communication method.

This application claims the benefit of Japanese Patent Application No.2013-128437 filed Jun. 19, 2013, the entire contents of which areincorporated herein by reference.

BACKGROUND ART

A radio access method and a radio network (hereinafter, referred to asLong-Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access(EUTRA)) of cellular mobile communication have been examined in theThird Generation Partnership Project (3GPP). In LTE, an orthogonalfrequency division multiplexing (OFDM) method is used for a downlink. InLTE, a single-carrier frequency division multiple access (SC-FDMA)method is used for an uplink. In LTE, a base station apparatus is alsoreferred to as evolved NodeB (eNodeB), and a mobile station apparatus isalso referred to as user equipment (UE). LTE is a cellular communicationsystem in which a plurality of areas covered by a base station apparatusare allocated in a cell form. A single base station apparatus may managea plurality of cells.

LTE corresponds to time division duplex (TDD). LTE employing the TDD isalso referred to as TD-LTE or LTE TDD. The TDD is a technique which canrealize full-duplex communication in a single frequency band throughtime division multiplexing of an uplink signal and a downlink signal.

In the 3GPP, it has been examined that a traffic adaptation techniqueand an interference reduction technique (DL-UL interference managementand traffic adaptation) in which a ratio of an uplink resource and adownlink resource is changed depending on uplink traffic and downlinktraffic are applied to the TD-LTE.

In NPL 1, a method of using a flexible subframe is proposed as a methodof realizing traffic adaptation. A base station apparatus can receive anuplink signal or transmit a downlink signal in a flexible subframe. InNPL 1, a mobile station apparatus regards the flexible subframe as adownlink subframe unless the mobile station apparatus is instructed totransmit an uplink signal in the flexible subframe by the base stationapparatus. The traffic adaptation technique is also referred to asdynamic TDD.

NPL 1 discloses that a hybrid automatic repeat request (HARQ) timing fora physical downlink shared channel (PDSCH) is determined on the basis ofan uplink-downlink configuration which is newly introduced, and thatHARQ timing for a physical uplink shared channel (PUSCH) is determinedon the basis of the initial UL-DL configuration.

NPL 2 discloses that (a) a UL/DL reference configuration is introduced,and (b) several subframes may be scheduled to be used for either anuplink or a downlink through dynamic grant/assignment from a scheduler.

In LTE release 10, a carrier aggregation technique is introduced inwhich a plurality of cells are set for a mobile station apparatus.

CITATION LIST

-   NPL 1: “On standardization impact of TDD UL-DL adaptation”,    R1-122016, Ericsson, ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #69,    Prague, Czech Republic, 21 to 25 May 2012.-   NPL 2: “Signaling support for dynamic TDD”, R1-130558, Ericsson,    ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #72, St Julian's, Malta, 28    Jan. to 1 Feb. 2013.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

Throughput can be considerably improved in a case where the dynamic TDDis applied compared with a case where the ratio of an uplink resourceand a downlink resource is not changed. However, in a radiocommunication system which employs the dynamic TDD, in a case where anuplink-downlink configuration applied to a mobile station apparatuswhich transmits an uplink control signal is different from anuplink-downlink configuration applied to another mobile stationapparatus inside or outside a cell, there is a problem in that adownlink signal which is transmitted by another mobile station apparatusat the same time interferes with the uplink control signal, and thus areception characteristic of the uplink control signal deteriorates.

An aspect of the present invention has been made in consideration of theproblem, and an object thereof is to provide a terminal apparatus anintegrated circuit, and a radio communication method capable of avoidinginterference with a downlink signal and transmitting an uplink controlsignal in a radio communication system which employs dynamic TDD.

Means for Solving the Problems

(1) In order to achieve the above-described object, the presentinvention provides the following means. In other words, according to anaspect of the present invention, there is provided a terminal apparatuswhich performs periodic channel state information reporting to a basestation apparatus, the terminal apparatus including a reception unitthat receives first information, second information, and indexinformation indicating a value for reporting periodicity of the channelstate information, from the base station apparatus; and a transmissioncontrol unit that determines the value for reporting periodicity of thechannel state information on the basis of the index information, inwhich the applicable value is based on a certain UL-DL configuration, inwhich, in a case where the second information is not configured, thecertain UL-DL configuration is a UL-DL configuration indicated by thefirst information, and in which, in a case where the second informationis configured, the certain UL-DL configuration is a UL-DL configurationindicated by the second information.

(2) In addition, in the aspect of the present invention, the receptionunit of the terminal apparatus receives third information, and a UL-DLconfiguration indicated by the third information is used for the channelstate information measurement.

(3) Further, in the aspect of the present invention, each of the firstinformation and the second information in the terminal apparatuscorresponds to a primary cell.

(4) In addition, in the aspect of the present invention, in a case wherethe second information is configured, a scheduling timing of a physicaluplink shared channel in the terminal apparatus is set according to aUL-DL configuration indicated by the first information, and a downlinkHARQ timing in the terminal apparatus is set according to a UL-DLconfiguration indicated by the second information.

(5) Further, in the aspect of the present invention, in a case where thesecond information is configured, an uplink scheduling timing and adownlink HARQ timing in the terminal apparatus are set according to aUL-DL configuration indicated by the first information.

(6) In addition, in the aspect of the present invention, the indexinformation in the terminal apparatus indicates an offset value for thechannel state information reporting.

(7) Further, according to another aspect of the present invention, thereis provided a base station apparatus which receives periodic channelstate information reporting from a terminal apparatus, the base stationapparatus including a CSI transmission timing determination unit thatgenerates index information indicating a value for reporting periodicityof the channel state information; and a transmission unit that transmitsfirst information, second information, and the index information to theterminal apparatus, in which the applicable value is based on a certainUL-DL configuration, in which, in a case where the second information isconfigured, a scheduling timing of a physical uplink shared channel isset according to a UL-DL configuration indicated by the firstinformation, a downlink HARQ timing is set according to a UL-DLconfiguration indicated by the second information, and the certain UL-DLconfiguration is the UL-DL configuration indicated by the secondinformation.

(8) In addition, in the aspect of the present invention, in a case wherethe second information is not configured, an uplink scheduling timingand a downlink HARQ timing in the base station apparatus are setaccording to a UL-DL configuration indicated by the first information,and the certain UL-DL configuration is the UL-DL configuration indicatedby the first information.

(9) Further, in the aspect of the present invention, the transmissionunit of the base station apparatus transmits third information, and aUL-DL configuration indicated by the third information is used for thechannel state information measurement.

(10) In addition, in the aspect of the present invention, each of thefirst information and the second information in the base stationapparatus corresponds to a primary cell.

(11) Further, in the aspect of the present invention, the indexinformation generated by the CSI transmission timing determination unitof the base station apparatus indicates an offset value for the channelstate information reporting.

(12) In addition, according to still another aspect of the presentinvention, there is provided an integrated circuit mounted in a terminalapparatus which performs periodic channel state information reporting toa base station apparatus, the integrated circuit causing the terminalapparatus to realize a series of functions including a function ofreceiving first information, second information, and index informationindicating a value for reporting periodicity of the channel stateinformation, from the base station apparatus; and a function ofdetermining the value for reporting periodicity of the channel stateinformation on the basis of the index information, in which theapplicable value is based on a certain UL-DL configuration, in which, ina case where the second information is not configured, the certain UL-DLconfiguration is a UL-DL configuration indicated by the firstinformation, and in which, in a case where the second information isconfigured, the certain UL-DL configuration is a UL configurationindicated by the second information.

(13) Further, according to still another aspect of the presentinvention, there is provided an integrated circuit mounted in a basestation apparatus which receives periodic channel state informationreporting from a terminal apparatus, the integrated circuit causing thebase station apparatus to realize a series of functions including afunction of generating index information indicating a value forreporting periodicity of the channel state information; and a functionof transmitting first information, second information, and the indexinformation to the terminal apparatus, in which the applicable value isbased on a certain UL-DL configuration, in which, in a case where thesecond information is configured, a scheduling timing of a physicaluplink shared channel is set according to a UL-DL configurationindicated by the first information, a downlink HARQ timing is setaccording to a UL-DL configuration indicated by the second information,and the certain UL-DL configuration is the UL-DL configuration indicatedby the second information.

(14) In addition, according to still another aspect of the presentinvention, there is provided a radio communication method used for aterminal apparatus which performs periodic channel state informationreporting to a base station apparatus, the method including receivingfirst information, second information, and index information indicatinga value for reporting periodicity of the channel state information, fromthe base station apparatus; and determining the value for reportingperiodicity of the channel state information on the basis of the indexinformation, in which the applicable value is based on a certain UL-DLconfiguration, in which, in a case where the second information is notconfigured, the certain UL-DL configuration is a UL-DL configurationindicated by the first information, and in which, in a case where thesecond information is configured, the certain UL-DL configuration is aUL-DL configuration indicated by the second information.

(15) Further, according to still another aspect of the presentinvention, there is provided a radio communication method used for abase station apparatus which receives periodic channel state informationreporting from a terminal apparatus, the method including generatingindex information indicating a value for reporting periodicity of thechannel state information; and transmitting first information, secondinformation, and the index information to the terminal apparatus, inwhich the applicable value is based on a certain UL-DL configuration, inwhich, in a case where the second information is configured, ascheduling timing of a physical uplink shared channel is set accordingto a UL-DL configuration indicated by the first information, downlinkHARQ timing is set according to a UL-DL configuration indicated by thesecond information, and the certain UL-DL configuration is the UL-DLconfiguration indicated by the second information.

Effects of the Invention

According to an aspect of the present invention, it is possible to avoidinterference with a downlink signal and to transmit an uplink controlsignal in a radio communication system which employs dynamic TDD.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a conceptual diagram of a radio communication system of thepresent embodiment.

FIG. 2 is a diagram illustrating a schematic configuration of a radioframe of the present embodiment.

FIG. 3 is a diagram illustrating a configuration of a slot of thepresent embodiment.

FIG. 4 is a diagram illustrating an example in which a physical channeland a physical signal are mapped in a downlink subframe of the presentembodiment.

FIG. 5 is a diagram illustrating an example in which a physical channeland a physical signal are mapped in an uplink subframe of the presentembodiment.

FIG. 6 is a diagram illustrating an example in which a physical channeland a physical signal are mapped in a special subframe of the presentembodiment.

FIG. 7 is a table illustrating an example of an uplink-downlinkconfiguration in the present embodiment.

FIG. 8 is a flowchart illustrating a setting method of a first uplinkreference UL-DL configuration and a first downlink reference UL-DLconfiguration in the present embodiment.

FIG. 9 is a flowchart illustrating a setting method of a second uplinkreference UL-DL configuration in the present embodiment.

FIG. 10 is a diagram illustrating a correspondence between a pair formedby the first uplink reference UL-DL configuration for the other servingcell (primary cell) and the first uplink reference UL-DL configurationfor a serving cell (secondary cell), and the second uplink referenceUL-DL configuration for the secondary cell in the present embodiment.

FIG. 11 is a flowchart illustrating a setting method of a seconddownlink reference UL-DL configuration in the present embodiment.

FIG. 12 is a diagram illustrating a correspondence between a pair formedby the first downlink reference UL-DL configuration for a primary celland the first downlink reference UL-DL configuration for a secondarycell, and the second downlink reference UL-DL configuration for thesecondary cell, in the present embodiment.

FIG. 13 is a diagram illustrating a relationship between a subframeindicated by the first uplink reference UL-DL configuration and asubframe indicated by the first downlink reference UL-DL configurationin the present embodiment.

FIG. 14 is a diagram illustrating a relationship between a subframeindicated by the first uplink reference UL-DL configuration, a subframeindicated by the first downlink reference UL-DL configuration, and asubframe indicated by a transmission direction UL-DL configuration inthe present embodiment.

FIG. 15 is a diagram illustrating a relationship between the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration in thepresent embodiment.

FIG. 16 is a diagram illustrating a correspondence between a subframe nin which PDCCH/EPDCCH/PHICH is allocated, and a subframe n+k in which aPUSCH corresponding to the PDCCH/EPDCCH/PHICH is allocated.

FIG. 17 is a diagram illustrating a correspondence between a subframe nin which a PHICH is allocated, and a subframe n−k in which a PUSCHcorresponding to the PHICH is allocated, in the present embodiment.

FIG. 18 is a diagram illustrating a correspondence between a subframe nin which a PUSCH is allocated, and a subframe n+k in which a PHICHcorresponding to the PUSCH is allocated, in the present embodiment. Themobile station apparatus 1 specifies (selects, determines) a value of kaccording to the table of FIG. 20.

FIG. 19 is a diagram illustrating a correspondence between a subframen-k in which a PDSCH is allocated, and a subframe n in which a HARQ-ACKcorresponding to the PDSCH is transmitted, in the present embodiment.

FIG. 20 is a diagram illustrating a relationship between a parameterI_(CQI/PMI) of which a notification is sent in a high layer, thereporting periodicity N_(pd) of a periodic CSI, and a timing offsetN_(OFFSET,CQI) in the present embodiment.

FIG. 21 is a diagram illustrating an example of a subframe in which aperiodic CSI is transmitted in the present embodiment.

FIG. 22 is a diagram illustrating the first downlink reference UL-DLconfiguration, a subframe number serving as an uplink subframe, and asupported periodic CSI reporting periodicity in the present embodiment.

FIG. 23 is a flowchart illustrating an example of a process ofrestricting (a) periodic CSI reporting periodicity/timing offset on thebasis of the first downlink reference UL-DL configuration in the presentembodiment.

FIG. 24 is a schematic block diagram illustrating a configuration of amobile station apparatus 1 of the present embodiment.

FIG. 25 is a schematic block diagram illustrating a configuration of abase station apparatus 3 of the present embodiment.

FIG. 26 is a diagram illustrating a relationship between a parameterI_(SR) of which a notification is sent in a high layer, the periodicitySR_(PERIODICITY) of a subframe in which an SR can be transmitted, and atiming offset N_(OFFSET,SR) in the present embodiment.

FIG. 27 is a diagram illustrating the first downlink reference UL-DLconfiguration, a subframe number serving as an uplink subframe, and aperiodicity of a subframe in which a supported SR can be transmitted inthe present embodiment.

FIG. 28 is a flowchart illustrating an example of a process ofrestricting (a) periodicity/timing offset of a subframe in which the SRcan be transmitted on the basis of the first downlink reference UL-DLconfiguration in the present embodiment.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described.

In the present embodiment, a plurality of cells are set for a mobilestation apparatus. A technique in which the mobile station apparatusperforms communication via the plurality of cells is referred to as cellaggregation or carrier aggregation. The present invention may be appliedto each of the plurality of cells set for the mobile station apparatus.In addition, the present invention may be applied to some of theplurality of set cells. The cell set for the mobile station apparatus isalso referred to as a serving cell.

The plurality of set serving cells includes a single primary cell andone or a plurality of secondary cells. The primary cell is a servingcell on which an initial connection establishment procedure isperformed, a serving cell on which a connection reestablishmentprocedure is started, or a cell which is indicated as a primary cell ina handover procedure. The secondary cell may be set when or after RRCconnection is established.

A radio communication system of the present embodiment employs a timedivision duplex (TDD) method. In a case of cell aggregation, the TDDmethod may be applied to all of a plurality of cells or some of thecells.

In a case where a plurality of cells to which the TDD is applied areaggregated, a half-duplex TDD method or a full-duplex TDD method isapplied thereto.

A mobile station apparatus of the half-duplex TDD method cannotsimultaneously perform uplink transmission and downlink reception in theplurality of cells to which the TDD is applied. In a case of thehalf-duplex TDD, the mobile station apparatus does not simultaneouslyperform transmission and reception in a single primary cell in a certainband, or in a single primary cell and one or a plurality of secondarycells in a plurality of different bands.

In the full-duplex TDD method, the mobile station apparatus cansimultaneously perform uplink transmission and downlink reception in aplurality of cells to which the TDD is applied. In a case of thefull-duplex TDD, the mobile station apparatus can simultaneously performtransmission and reception in a plurality of serving cells in aplurality of different bands.

The mobile station apparatus transmits information indicatingcombinations of bands in which carrier aggregation is supported by themobile station apparatus, to a base station apparatus. The mobilestation apparatus transmits, to the base station apparatus, informationindicating whether or not simultaneous transmission and reception in theplurality of serving cells in a plurality of different bands issupported in each of the combinations of bands.

In a case where a cell to which the TDD is applied and a cell to whichfrequency division duplex (FDD) is applied are aggregated, the presentinvention is applicable to the cell to which the TDD is applied.

In the present embodiment, “X/Y” indicates “X or Y”. In the presentembodiment, “X/Y” indicates “X and Y”. In the present embodiment, “X/Y”indicates “X and/or Y”.

FIG. 1 is a conceptual diagram of a radio communication system of thepresent embodiment. In FIG. 1, the radio communication system includesmobile station apparatuses 1A to 1C, and a base station apparatus 3.Hereinafter, the mobile station apparatuses 1A to 1C are referred to a“mobile station apparatus 1”.

A physical channel and a physical signal of the present embodiment willbe described.

In FIG. 1, the following uplink physical channels are used for uplinkradio communication from the mobile station apparatus 1 to the basestation apparatus 3. The uplink physical channels are used to transmitinformation which is output by a higher layer.

-   -   Physical uplink control channel (PUCCH)    -   Physical uplink shared channel (PUSCH)    -   Physical random access channel (PRACH)

The PUCCH is a physical channel used to transmit uplink controlinformation (UCI). The uplink control information includes channel stateinformation (CSI) of downlink, a scheduling request (SR) indicating arequest for a PUSCH resource, and acknowledgement (ACK)/negativeacknowledgement ACK (NACK) for downlink data (transport block,downlink-shared channel: DL-SCH). The ACK/NACK is also referred to as aHARQ-ACK, HARQ feedback, or response information.

The PUSCH is a physical channel used to transmit uplink data(uplink-shared channel: UL-SCH). In addition, the PUSCH may be used totransmit the HARQ-ACK and/or the CSI along with the uplink data.Further, the PUSCH may be used to transmit only the CSI, or only theHARQ-ACK and the CSI.

The PRACH is a physical channel used to transmit a random accesspreamble. The PRACH is mainly used for the mobile station apparatus 1 tobe synchronized with the base station apparatus 3 in a time domain. Inaddition, the PRACH is also used to indicate synchronization (timingadjustment) with an initial connection establishment procedure, ahandover procedure, a connection reestablishment procedure, and uplinktransmission, and to indicate a request for a PUSCH resource.

In FIG. 1, the following uplink physical signal is used for the uplinkradio communication. The uplink physical signal is not used to transmitinformation output from a high layer but is used by a physical layer.

-   -   Uplink reference signal (UL RS)

In the present embodiment, the following two types of uplink referencesignals are used.

-   -   Demodulation reference signal (DMRS)    -   Sounding reference signal (SRS)

The DMRS is related to transmission of the PUSCH or the PUCCH. The DMRSis subject to time division multiplexing with the PUSCH or the PUCCH.The base station apparatus 3 uses the DMRS to perform channel correctionof the PUSCH or the PUCCH. Hereinafter, transmission of both of thePUSCH and the DMRS is simply referred to transmission of the PUSCH.Hereinafter, transmission of both of the PUCCH and the DMRS is simplyreferred to transmission of the PUCCH.

The SRS is not related to transmission of the PUSCH or the PUCCH. Thebase station apparatus 3 uses the SRS to measure an uplink channelstate. The mobile station apparatus 1 transmits a first SRS in a firstresource which is set by a high layer. In addition, in a case whereinformation indicating a request for transmitting the SRS is receivedvia a PDCCH, the mobile station apparatus 1 transmits a second SRS onlyonce in a second resource which is set by the high layer. The first SRSis also referred to as a periodic SRS or a type 0 triggered SRS. Thesecond SRS is also referred to as an aperiodic SRS or a type 1 triggeredSRS. Transmission of the aperiodic SRS is scheduled by informationindicating a request for transmission of the SRS.

In FIG. 1, the following downlink physical channels are used fordownlink radio communication from the base station apparatus 3 to themobile station apparatus 1. The downlink physical channels are used totransmit information output from a high layer.

-   -   Physical broadcast channel (PBCH)    -   Physical control format indicator channel (PCFICH)    -   Physical hybrid automatic repeat request indicator channel        (PHICH)    -   Physical downlink control channel (PDCCH)    -   Enhanced physical downlink control channel (EPDCCH)    -   Physical downlink shared channel (PDSCH)    -   Physical multicast channel (PMCH)

The PBCH is used to send a notification of master information block(MIB, or broadcast channel: BCH) which is used in common by the mobilestation apparatuses 1. The MIB is transmitted at intervals of 40 ms, andthe MIB is repeatedly transmitted with periodicity of 10 ms.Specifically, initial transmission of the MIB is performed in a subframe0 of a radio frame satisfying SFN mod 4=0, and retransmission(repetition) of the MIB is performed in subframes 0 of all other radioframes. The SFN (system frame number) is a radio frame number. The MIBis system information. For example, the MIB includes informationindicating the SFN.

The PCFICH is used to transmit information indicating a region (OFDMsymbol) which is used to transmit the PDCCH.

The PHICH is used to transmit a HARQ indicator (HARQ feedback orresponse information) indicating an acknowledgement (ACK) or negativeacknowledgement (NACK) of uplink data (uplink shared channel: UL-SCH)received by the base station apparatus 3. For example, in a case where aHARQ indicator indicating an ACK is received, the mobile stationapparatus 1 does not retransmit corresponding uplink data. For example,in a case where a HARQ indicator indicating a NACK is received, themobile station apparatus 1 retransmits corresponding uplink data. Asingle PHICH transmits a HARQ indicator for a single item of uplinkdata. The base station apparatus 3 transmits respective HARQ indicatorsfor a plurality of uplink data items included in the same PUSCH, byusing a plurality of PHICHs.

The PDCCH and the EPDCCH are used to transmit downlink controlinformation (DCI). The downlink control information is also referred toas a DCI format. The downlink control information includes a downlinkgrant and an uplink grant. The downlink grant is also referred to asdownlink assignment or downlink allocation.

The downlink grant is used for scheduling a single PDSCH in a singlecell. The downlink grant is used for scheduling a PDSCH in the samesubframe as a subframe in which the downlink grant is transmitted. Theuplink grant is used for scheduling a single PUSCH in a single cell. Theuplink grant is used for scheduling a single PUSCH in a subframe whichoccurs four or more subframes later than a subframe in which the uplinkgrant is transmitted.

A cyclic redundancy check (CRC) parity bit is added to the DCI format.The CRC parity bit is scrambled with a cell-radio network temporaryidentifier (C-RNTI), or a semi-persistent scheduling cell-radio networktemporary identifier (SPS C-RNTI). The C-RNTI and the SPS C-RNTI areidentifiers for identifying a mobile station apparatus in a cell.

The C-RNTI is used to control the PDSCH or the PUSCH in a singlesubframe. The SPS C-RNTI is used to periodically allocate a PDSCH orPUSCH resource.

The PDSCH is used to transmit downlink data (downlink shared channel:DL-SCH).

The PMCH is used to transmit multicast data (multicast channel: MCH).

In FIG. 1, the following downlink physical signals are used for thedownlink radio communication. The downlink physical signals are not usedto transmit information output from a high layer but are used by aphysical layer.

-   -   Synchronization signal (SS)    -   Downlink reference signal (DL RS)

The synchronization signal is used for the mobile station apparatus 1 toperform synchronization of a frequency domain and a time domain ofdownlink. In the TDD method, the synchronization signal is mapped insubframes 0, 1, 5 and 6 of a radio frame. In the FDD method, thesynchronization signal is mapped in subframes 0 and 5 of a radio frame.

The downlink reference signal is used for the mobile station apparatus 1to perform channel correction of the downlink physical channel. Thedownlink reference signal is used for the mobile station apparatus 1 tocalculate channel state information of downlink.

In the present embodiment, the following five types of downlinkreference signals are used.

-   -   Cell-specific reference signal (CRS)    -   UE-specific reference signal (URS) related to a PDSCH    -   Demodulation reference signal (DMRS) related to an EPDCCH    -   Non-zero power channel state information-reference signal (NZP        CSI-RS)    -   Zero power channel state information-reference signal (ZP        CSI-RS)    -   Multimedia broadcast and multicast service over single frequency        network reference signal (MBSFN RS)    -   Positioning reference signal (PRS)

The CRS is transmitted with all subframes. The CRS is used to demodulatePBCH/PDCCH/PHICH/PCFICH/PDSCH. The CRS may be used for the mobilestation apparatus 1 to calculate channel state information of downlink.The PBCH/PDCCH/PHICH/PCFICH are (is) transmitted via an antenna portwhich is used to transmit the CRS.

The URS related to a PDSCH is transmitted with a subframe and a bandwhich are used to transmit the PDSCH to which the URS is related. TheURS is used to demodulate a PDSCH to which the URS is related.

The PDSCH is transmitted via an antenna port which is used to transmit aCRS or a URS. A DCI format 1A is used for scheduling a PDSCH which istransmitted via an antenna port used to transmit a CRS. A DCI format 2Dis used for scheduling a PDSCH which is transmitted via an antenna portused to transmit a URS.

The DMRS related to an EPDCCH is transmitted with a subframe and a bandwhich are used to transmit the EPDCCH to which the DMRS is related. TheDMRS is used to demodulate an EPDCCH to which the DMRS is related. TheEPDCCH is transmitted via an antenna port which is used to transmit theDMRS.

The NZP CSI-RS is transmitted in a set subframe. A resource in which theNZP CSI-RS is transmitted is set by the base station apparatus. The NZPCSI-RS is used for the mobile station apparatus 1 to calculate channelstate information of downlink.

A resource of the ZP CSI-RS is set by the base station apparatus. Thebase station apparatus transmits the ZP CSI-RS with zero output. Inother words, the base station apparatus does not transmit the ZP CSI-RS.The base station apparatus does not transmit a PDSCH and an EPDCCH in aset resource of the NZP CSI-RS. For example, the mobile stationapparatus 1 can measure interference in a resource corresponding to theNZP CSI-RS in a certain cell.

The MBSFN RS is transmitted in all bands of a subframe which is used totransmit the PMCH. The MBSFN RS is used to decode the PMCH. The PMCH istransmitted via an antenna port which is used to transmit the MBSFN RS.

The PRS is used for the mobile station apparatus to measure ageographical position thereof.

The downlink physical channel and the downlink physical signal arecollectively referred to as a downlink signal. The uplink physicalchannel and the uplink physical signal are collectively referred to asan uplink signal. The downlink physical channel and the uplink physicalchannel are collectively referred to as a physical channel. The downlinkphysical signal and the uplink physical signal are collectively referredto a physical signal.

The BCH, the MCH, the UL-SCH and the DL-SCH are transport channels. Achannel used by a medium access control (MAC) layer is referred to as atransport channel. The unit of the transport channel used by the MAClayer is referred to as a transport block (TB) or a MAC protocol dataunit (PDU). In the MAC layer, control of a hybrid automatic repeatrequest (HARQ) is performed on each transport block. The transport blockis the unit of data which is delivered to a physical layer by the MAClayer. In the physical layer, the transport block is mapped to acodeword, and a coding process is performed on each codeword.

Hereinafter, a configuration of the radio frame of the presentembodiment will be described.

FIG. 2 is a diagram illustrating a schematic configuration of the radioframe of the present embodiment. Each radio frame has a length of 10 ms.In FIG. 2, a transverse axis is a time axis. In addition, each radioframe is constituted by two half frames. Each of the half frames has alength of 5 ms. Each of the half frames is constituted by fivesubframes. Each of the subframes has a length of 1 ms and is defined bytwo continuous slots. Each of the slots has a length of 0.5 ms. An i-thsubframe of the radio frame is constituted by a (2×i)-th slot and a(2×i+1)-th slot. In other words, ten subframes can be used at intervalsof 10 ms.

In the present embodiment, the following three types of subframes aredefined.

-   -   Downlink subframe (first subframe)    -   Uplink subframe (second subframe)    -   Special subframe (third subframe)

The downlink subframe is a subframe which is reserved for downlinktransmission. The uplink subframe is a subframe which is reserved foruplink transmission. The special subframe is constituted by threefields. The three fields are a downlink pilot time slot (DwPTS), a guardperiod (GP), and an uplink pilot time slot (UpPTS). A total length ofthe DwPTS, the GP, and the UpPTS is 1 ms. The DwPTS is a field which isreserved for downlink transmission. The UpPTS is a field which isreserved for uplink transmission. The GP is a field in which downlinktransmission and uplink transmission are not performed. In addition, thespecial subframe may consist of only the DwPTS and GP, and may consistof only the GP and the UpPTS.

A single radio frame is constituted by at least a downlink subframe, anuplink subframe, and a special subframe.

The radio communication system of the present embodiment supports thedownlink-to-uplink switch-point periodicities of 5 ms and 10 ms.

In a case where the downlink-to-uplink switch-point periodicity is 5 ms,a special subframe is included in both half frames of the radio frame.

In a case where the downlink-to-uplink switch-point periodicity is 10ms, a special subframe is included only in the first half frame of theradio frame.

Hereinafter, a configuration of the slot of the present embodiment willbe described.

FIG. 3 is a diagram illustrating a configuration of the slot of thepresent embodiment. A physical signal or a physical channel transmittedin each slot is expressed by a resource grid. In FIG. 3, a transverseaxis is a time axis, and a longitudinal axis is a frequency axis. In adownlink, the resource grid is defined by a plurality of subcarriers anda plurality of OFDM symbols. In an uplink, the resource grid is definedby a plurality of subcarriers and a plurality of SC-FDMA symbols. Thenumber of subcarriers forming a single slot depends on a bandwidth of acell. The number of OFDM symbols or SC-FDMA symbols forming a singleslot is seven. Each of elements of the resource grid is referred to as aresource element. The resource element is identified by using asubcarrier number and an OFDM symbol number or an SC-FDMA symbol number.

A resource block is used to express mapping of a certain physicalchannel (a PDSCH, a PUSCH, or the like) to a resource element. Theresource block includes a virtual resource block and a physical resourceblock. A certain physical channel is first mapped to the virtualresource block. Then, the virtual resource block is mapped to thephysical resource block. A single physical resource block is defined byseven continuous OFDM symbols or SC-FDMA symbols in the time domain, andtwelve contiguous subcarriers in the frequency domain. Therefore, asingle physical resource block is constituted by (7×12) resourceelements. In addition, a single physical resource block corresponds to asingle slot in the time domain and corresponds to 180 kHz in thefrequency domain. The physical resource block may be numbered from 0 inthe frequency domain.

Hereinafter, a description will be made of a physical channel and aphysical signal transmitted in each subframe.

FIG. 4 is a diagram illustrating an example of an arrangement ofphysical channels and physical signals in a downlink subframe of thepresent embodiment. In FIG. 4, a transverse axis is a time axis, and alongitudinal axis is a frequency axis. The base station apparatus 3 maytransmit the downlink physical channels (the PBCH, the PCFICH, thePHICH, the PDCCH, the EPDCCH, and the PDSCH) and the downlink physicalsignals (the synchronization signal and the downlink reference signal)in the downlink subframe. In addition, the PBCH is transmitted only inthe subframe 0 of the radio frame. Further, the downlink referencesignal is mapped in resource elements which are distributed in thefrequency domain and the time domain. For simplification of description,the downlink reference signal is not illustrated in FIG. 4.

In a PDCCH region, a plurality of PDCCHs may be subject to frequency andtime multiplexing. In an EPDCCH region, a plurality of EPDCCHs may besubject to frequency and time multiplexing. In a PDSCH region, aplurality of PDSCHs may be subject to frequency and time multiplexing.The PDCCH and the PDSCH or the EPDCCH may be subject to timemultiplexing. The PDSCH and the EPDCCH may be subject to frequencymultiplexing.

FIG. 5 is a diagram illustrating an example of an arrangement ofphysical channels and physical signals in an uplink subframe of thepresent embodiment. In FIG. 5, a transverse axis is a time axis, and alongitudinal axis is a frequency axis. The mobile station apparatus 1may transmit the uplink physical channels (the PUCCH, the PUSCH, and thePRACH) and the uplink physical signals (the DMRS and the SRS). In aPUCCH region, a plurality of PUCCHs may be subject to frequency, timeand code multiplexing. In a PUSCH region, a plurality of PUSCHs may besubject to frequency and spatial multiplexing in the uplink subframe.The PUCCH and the PUSCH may be subject to frequency multiplexing. ThePRACH may be allocated in a single subframe or across two subframes. Inaddition, a plurality of PRACHs may be subject to code multiplexing.

The SRS is transmitted by using the last SC-FDMA symbol of the uplinksubframe. In other words, the SRS is mapped in the last SC-FDMA symbolof the uplink subframe. The mobile station apparatus 1 cannotsimultaneously transmit the SRS and the PUCCH/PUSCH/PRACH in a singleSC-FDMA symbol of a single cell. In a single uplink subframe of a singlecell, the mobile station apparatus 1 can transmit the PUSCH and/or thePUCCH by using SC-FDMA symbols excluding the last SC-FDMA symbol of theuplink subframe, and can transmit the SRS by using the last SC-FDMAsymbol of the uplink subframe. In other words, in the single uplinksubframe of the single cell, the mobile station apparatus 1 can transmitboth the SRS and the PUSCH/PUCCH. In addition, the DMRS is subject totime multiplexing with the PUCCH or the PUSCH. For simplification ofdescription, the DMRS is not illustrated in FIG. 5.

FIG. 6 is a diagram illustrating an example of an arrangement ofphysical channels and physical signals in a special subframe of thepresent embodiment. In FIG. 6, a transverse axis is a time axis, and alongitudinal axis is a frequency axis. In FIG. 6, the DwPTs isconstituted by the first to tenth SC-FDMA symbols of the specialsubframe, the GP is constituted by the eleventh and twelfth SC-FDMAsymbols of the special subframe, and the UpPTS is constituted by thethirteenth and fourteenth SC-FDMA symbols of the special subframe.

The base station apparatus 3 may transmit the PCFICH, the PHICH, thePDCCH, the EPDCCH, the PDSCH, the synchronization signal, and thedownlink reference signal in the DwPTS of the special subframe. The basestation apparatus 3 may not transmit the PBCH in the DwPTS of thespecial subframe. The mobile station apparatus 1 may transmit the PRACHand the SRS in the UpPTS of the special subframe. In other words, themobile station apparatus 1 does not transmit the PUCCH, the PUSCH, andthe DMRS in the UpPTS of the special subframe.

Hereinafter, a description will be made of the first uplink referenceUL-DL configuration, the first downlink reference UL-DL configuration,the second uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and the transmission direction UL-DLconfiguration.

The first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, the second uplink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration are defined by anuplink-downlink configuration (UL-DL configuration).

The uplink-downlink configuration is a configuration related to apattern of subframes of a radio frame. The uplink-downlink configurationindicates that each subframe of the radio frame is one of a downlinksubframe, an uplink subframe, and a special subframe.

In other words, the first uplink reference UL-DL configuration, thefirst downlink reference UL-DL configuration, the second uplinkreference UL-DL configuration, the second downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration aredefined by patterns of the downlink subframe, the uplink subframe, andthe special subframe of the radio frame.

The patterns of the downlink subframe, the uplink subframe, and thespecial subframe are those each of subframes #0 to #9 and indicate anyone of the downlink subframe, the uplink subframe, and the specialsubframe, and, preferably, each subframe is represented by anycombination in which D, U, and S (respectively indicating the downlinksubframe, the uplink subframe, and the special subframe) have a lengthof 10. More preferably, a leading subframe (that is, the subframe #0) isD, and the second subframe (that is, the subframe #1) is S.

FIG. 7 is a table illustrating an example of an uplink-downlinkconfiguration in the present embodiment. In FIG. 7, D indicates adownlink subframe, U indicates an uplink subframe, and S indicates aspecial subframe.

In FIG. 7, a subframe 1 of the radio frame is a special subframe at alltimes. In FIG. 7, subframes 0 to 5 are reserved for downlinktransmission at all times, and the subframe 1 is reserved for uplinktransmission at all times.

In FIG. 7, in a case where the downlink-to-uplink switch-pointperiodicity is 5 ms, a subframe 6 of the radio frame is a specialsubframe. In a case where the downlink-to-uplink switch-pointperiodicity is 10 ms, the subframe 6 of the radio frame is a downlinksubframe.

The first uplink reference UL-DL configuration is also referred to as afirst parameter, a first configuration, or a serving cell UL-DLconfiguration. The first downlink reference UL-DL configuration is alsoreferred to as a second parameter or a second configuration. The seconduplink reference UL-DL configuration is also referred to as a thirdparameter or a third configuration. The second downlink reference UL-DLconfiguration is also referred to as a fourth parameter or a fourthconfiguration. The transmission direction UL-DL configuration is alsoreferred to as a fifth parameter or a fifth configuration.

An uplink-downlink configuration i being set as the first or seconduplink reference UL-DL configuration is referred to as first or seconduplink reference UL-DL configuration i being set. An uplink-downlinkconfiguration i is being set as the first or second downlink referenceUL-DL configuration is referred to as first or second downlink referenceUL-DL configuration i being set. An uplink-downlink configuration ibeing set as the transmission direction UL-DL configuration is referredto as a transmission direction UL-DL configuration i being set.

Hereinafter, a description will be made of a method of setting the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration.

The base station apparatus 3 sets the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration. The base station apparatus 3may transmit first information (TDD-Config) indicating the first uplinkreference UL-DL configuration, second information indicating the firstdownlink reference UL-DL configuration, and third information indicatingthe transmission direction UL-DL configuration, which include at leastone of an MIB, a system information block type 1 message, a systeminformation message, an RRC message, an MAC control element (CE), andcontrol information (for example, a DCI format) of a physical layer. Inaddition, the base station apparatus 3 may include the firstinformation, the second information, and the third information in atleast one of the MIB, the system information block type 1 message, thesystem information message, the RRC message, the MAC control element(CE), and the control information (for example, a DCI format) of aphysical layer, depending on circumstances.

The first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, the second uplink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration may be defined for eachof a plurality of serving cells.

The base station apparatus 3 transmits the first information, the secondinformation, and the third information for each serving cell, to themobile station apparatus 1 for which a plurality of serving cells areset. In addition, the first information, the second information, and thethird information may be defined for each serving cell.

The base station apparatus 3 may transmit, to the mobile stationapparatus 1 for which two serving cells including a primary cell and asecondary cell, the first information for the primary cell, the secondinformation for the primary cell, the third information for the primarycell, the first information for a secondary cell, the second informationfor the secondary cell, and the third information for the secondarycell.

The mobile station apparatus 1 for which the plurality of serving cellsare set may set the first uplink reference UL-DL configuration, thefirst downlink reference UL-DL configuration, and the transmissiondirection UL-DL configuration in each serving cell on the basis of thefirst information, the second information, and the third information.

The mobile station apparatus 1 for which two serving cells including aprimary cell and a secondary cell are set may set the first uplinkreference UL-DL configuration for the primary cell, the first downlinkreference UL-DL configuration for the primary cell, and the transmissiondirection UL-DL configuration the primary cell, the first uplinkreference UL-DL configuration for the secondary cell, the first downlinkreference UL-DL configuration for the secondary cell, and thetransmission direction DL-UL configuration for the secondary cell.

The first information for the primary cell is preferably included in thesystem information block type 1 message, or the RRC message. The firstinformation for the secondary cell is preferably included in the RRCmessage. The second information for the primary cell is preferablyincluded in the system information block type 1 message, the systeminformation message, or the RRC message. The second information for thesecondary cell is preferably included in the RRC message. The thirdinformation is preferably included in the MIB, the MAC CE, or thecontrol information (for example, a DCI format) of a physical layer.

The first information is preferably common to a plurality of mobilestation apparatuses 1 in a cell. The second information may be common tothe plurality of mobile station apparatuses 1 in the cell, and may bededicated to the mobile station apparatus 1. The third information maybe common to the plurality of mobile station apparatuses 1 in the cell,and may be dedicated to the mobile station apparatus 1.

The second information may be transmitted along with the firstinformation. The mobile station apparatus 1 in which the first downlinkreference UL-DL configuration is not set on the basis of the secondinformation may not receive the third information.

The periodicity of changing the transmission direction UL-DLconfiguration is preferably shorter than the periodicity of changing thedownlink reference UL-DL configuration. A frequency of changing thetransmission direction UL-DL configuration is preferably lower than afrequency of changing the downlink reference UL-DL configuration. Theperiodicity of changing the downlink reference UL-DL configuration ispreferably shorter than the periodicity of changing the uplink referenceUL-DL configuration. A frequency of changing the downlink referenceUL-DL configuration is preferably lower than a frequency of changing theuplink reference UL-DL configuration.

The system information block type 1 message is initially transmitted inthe subframe 5 of a radio frame satisfying SFN mod 8=0, via a PDSCH, andundergoes retransmission (repetition) in the subframe 5 of anothersubframe satisfying SFN mod 2=0. The system information block type 1message includes information indicating a configuration (lengths of aDwPTS, a GP, and a UpPTS) of a special subframe. The system informationblock type 1 message is cell-specific information.

The system information message is transmitted via the PDSCH. The systeminformation message is cell-specific information. The system informationmessage includes system information blocks X other than the systeminformation block type 1 message.

The RRC message is transmitted via the PDSCH. The RRC message isinformation/signal which is processed in an RRC layer. The RRC may becommon to a plurality of mobile station apparatuses 1 in a cell, and maybe dedicated to a specified mobile station apparatus 1.

The MAC CE is transmitted via the PDSCH. The MAC CE isinformation/signal which is processed in an MAC layer.

In a case where an RRC message including the first information, and/orthe second information, and/or the third information are (is) receivedvia the PDSCH, the mobile station apparatus 1 preferably sets (makesvalid) the first uplink reference UL-DL configuration, and/or the firstdownlink reference UL-DL configuration, and/or the transmissiondirection UL-DL configuration in a subframe (timing) in which an RRCconnection reconfiguration completion message corresponding to the RRCmessage is transmitted.

In a case where an MIB including the first information, and/or thesecond information, and/or the third information is received via a PBCHin a subframe n−k, the mobile station apparatus 1 preferably sets (makesvalid) the first uplink reference UL-DL configuration/the first downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration in a subframe n. For example, k is 4 or 8. For example, kis determined on the basis of a table of FIG. 19 and the present firstor second downlink reference UL-DL configuration. FIG. 19 will bedescribed later.

In a case where an MAC CE including the first information, and/or thesecond information, and/or the third information is received via a PDSCHin a subframe n−k, the mobile station apparatus 1 preferably sets (makesvalid) the first uplink reference UL-DL configuration, and/or the firstdownlink reference UL-DL configuration, and/or the transmissiondirection UL-DL configuration in a subframe n. For example, k is 4 or 8.For example, a subframe n+k is a subframe for transmitting a HARQ-ACK(ACK) of the PDSCH which is used to transmit the MAC CE. For example, kis determined on the basis of the table of FIG. 19 and the present firstor second downlink reference UL-DL configuration.

In a case where control information (for example, a DCI format) of aphysical layer including the first information, and/or the secondinformation, and/or the third information is received via a downlinkphysical channel (for example, a PDCCH/EPDCCH) in a subframe n−k, themobile station apparatus 1 preferably sets (makes valid) the firstuplink reference UL-DL configuration, and/or the first downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration in a subframe n. For example, k is 4 or 8. For example, asubframe n+k is a subframe for transmitting a HARQ-ACK (ACK) of thedownlink physical channel (for example, a PDCCH/EPDCCH) which is used totransmit the control information (for example, a DCI format) of aphysical layer. For example, k is determined on the basis of the tableof FIG. 19 and the present first or second downlink reference UL-DLconfiguration.

In addition, the mobile station apparatus 1 which receives the firstinformation for a certain serving cell and does not receive the secondinformation for the certain serving cell, and the base station apparatus3 which transmits the first information for the certain serving cell anddoes not transmit the second information for the certain cell may setthe first downlink reference UL-DL configuration for the certain servingcell on the basis of the first information for the certain serving cell.The mobile station apparatus 1 may disregard the third information forthe certain serving cell for which the first downlink reference UL-DLconfiguration is set on the basis of the first information.

FIG. 8 is a flowchart illustrating a method of setting the first uplinkreference UL-DL configuration and the first downlink reference UL-DLconfiguration in the present embodiment. The mobile station apparatus 1performs the setting method illustrated in FIG. 8 on each of a pluralityof serving cells.

The mobile station apparatus 1 sets the first uplink reference UL-DLconfiguration for a certain serving cell on the basis of the firstinformation (S1000). The mobile station apparatus 1 determines whetheror not the second information for the certain serving cell has beenreceived (S1002). If the second information for the certain serving cellhas been received, the mobile station apparatus 1 sets the firstdownlink reference UL-DL configuration for the certain serving cell onthe basis of the second information for the certain serving cell(S1006). If the second information for the certain serving cell has notbeen received (else/otherwise), the mobile station apparatus 1 sets thefirst downlink reference UL-DL configuration for the certain servingcell on the basis of the first information for the certain serving cell(S1004).

A serving cell for which the first uplink reference UL-DL configurationand the first downlink reference UL-DL configuration are set on thebasis of the first information is also referred to as a serving cell forwhich dynamic TDD is not set. A serving cell for which the firstdownlink reference UL-DL configuration is set on the basis of the secondinformation is also referred to as a serving cell for which the dynamicTDD is set.

In a case where the first downlink reference UL-DL configuration isreset for a serving cell for which the transmission direction UL-DLconfiguration has been set, the mobile station apparatus 1 mayclear/discard the transmission direction UL-DL configuration for theserving cell.

In addition, in a case where the first downlink reference UL-DLconfiguration which is reset for a serving cell for which thetransmission direction UL-DL configuration has been set is the same asthe previous first downlink reference UL-DL configuration, the mobilestation apparatus 1 may not clear/discard the transmission directionUL-DL configuration. In other words, in a case where the first downlinkreference UL-DL configuration for a serving cell for which thetransmission direction UL-DL configuration has been set is changed, themobile station apparatus 1 may clear/discard the transmission directionUL-DL configuration for the serving cell.

In a case where the base station apparatus 3 instructs the mobilestation apparatus 1 to reset/change the first downlink reference UL-DLconfiguration for a serving cell for which the transmission directionUL-DL configuration has been set, it may be regarded that thetransmission direction UL-DL configuration for the serving cell iscleared/discarded by the mobile station apparatus 1.

Further, in a case where the first uplink reference UL-DL configurationfor a serving cell for which the first downlink reference UL-DLconfiguration and the transmission direction UL-DL configuration havebeen set is reset, the mobile station apparatus 1 may clear/discard thefirst downlink reference UL-DL configuration and the transmissiondirection UL-DL configuration.

In a case where the base station apparatus 3 instructs the mobilestation apparatus 1 to reset/change the first uplink reference UL-DLconfiguration for a serving cell for which the first downlink referenceUL-DL configuration and the transmission direction UL-DL configurationhave been set is reset, it may be regarded that the first downlinkreference UL-DL configuration and the transmission direction UL-DLconfiguration may be cleared/discarded by the mobile station apparatus1.

The mobile station apparatus 1 receives the second information,determines a subframe in which an uplink signal can be transmitted onthe basis of the second information, and then monitors whether or notthe third information is received. If the third information is received,a subframe is determined in which an uplink signal can be transmitted onthe basis of the third information.

For example, the base station apparatus 3 transmits the thirdinformation to the mobile station apparatus 1 by using (a) PDCCH/EPDCCH.The third information is used to control dynamic TDD operation incoverage of the base station apparatus 3 (cell). The third informationis transmitted and received in a common search space (CSS) or aUE-specific search space (USS).

The CSS is a space in which the plurality of mobile station apparatuses1 monitor (a) PDCCH/EPDCCH. The USS is a space which is defined on thebasis of at least a C-RNTI. The C-RNTI is an identifier which isuniquely assigned to the mobile station apparatus 1.

The C-RNTI may be used to transmit a DCI format including the thirdinformation (information indicating a transmission direction of asubframe). An RNTI different from the C-RNTI and the SPS C-RNTI may beused to transmit a DCI format including the third information(information indicating a transmission direction of a subframe). TheRNTI is also referred to as an X-RNTI. In other words, a CRC parity bitadded to the DCI format including the third information is scrambledwith the C-RNTI or the X-RNTI.

In addition, a subframe may be restricted which is used for the mobilestation apparatus 1 to monitor the PDCCH/EPDCCH including the thirdinformation. The base station apparatus 3 may control a subframe whichis used for the mobile station apparatus 1 to monitor the PDCCH/EPDCCHincluding the third information. The base station apparatus 3 maytransmit, to the mobile station apparatus 1, information indicating thesubframe used for the mobile station apparatus 1 to monitor thePDCCH/EPDCCH including the third information.

For example, the PDCCH/EPDCCH including the third information may beallocated at intervals of ten subframes. For example, the mobile stationapparatus 1 monitors the third information at intervals of tensubframes. A subframe in which the PDCCH/EPDCCH including the thirdinformation may be determined in advance. For example, the thirdinformation may be mapped only in the subframe 0 or 5 of the radioframe.

The base station apparatus 3 transmits the third information only in acase where it is determined that the third information is necessary. Forexample, in a case where it is determined that the transmissiondirection UL-DL configuration is changed, the base station apparatus 3transmits the third information. For example, in a case where it isdetermined that the mobile station apparatus 1 which starts a dynamicTDD operation is required to be notified of the third information, thebase station apparatus 3 transmits the third information thereto.

The mobile station apparatus 1 which starts the dynamic TDD operationmonitors the PDCCH/EPDCCH including the third information in a subframein which the PDCCH/EPDCCH including the third information is allocated.

The mobile station apparatus 1 may monitor the third information only ina case where the mobile station apparatus is set to monitor the thirdinformation. For example, the mobile station apparatus 1 may monitor thethird information only in a case where the first downlink referenceconfiguration is set.

The mobile station apparatus 1 tries to decode a received signal anddetermines whether or not the PDCCH/EPDCCH including the thirdinformation is detected. In a case where the PDCCH/EPDCCH including thethird information is detected, the mobile station apparatus 1 determinesa subframe in which an uplink signal can be transmitted on the basis ofthe detected third information. In a case where the PDCCH/EPDCCHincluding the third information is not detected, the mobile stationapparatus 1 may maintain a determination hitherto regarding a subframein which an uplink signal can be transmitted.

Hereinafter, a description will be made of a method of setting thesecond uplink reference UL-DL configuration.

In a case where a plurality of serving cells are set for the mobilestation apparatus 1, and the first uplink reference UL-DL configurationsfor at least two serving cells are different from each other, the mobilestation apparatus 1 and the base station apparatus 3 set the seconduplink reference UL-DL configuration.

Except for the case where a plurality of serving cells are set for themobile station apparatus 1, and the first uplink reference UL-DLconfigurations for at least two serving cells are different from eachother, the mobile station apparatus 1 and the base station apparatus 3may not set the second uplink reference UL-DL configuration.

A case excluding the case where the first uplink reference UL-DLconfigurations for at least two serving cells are different from eachother is a case where the first uplink reference UL-DL configurationsfor all the serving cells are the same as each other. In a case where asingle serving cell is set for the mobile station apparatus 1, themobile station apparatus 1 and the base station apparatus 3 may not setthe second uplink reference UL-DL configuration.

FIG. 9 is a flowchart illustrating a method of setting the second uplinkreference UL-DL configuration in the present embodiment. In FIG. 9, asingle primary cell and a single secondary cell are set for the mobilestation apparatus 1. The mobile station apparatus 1 performs the settingmethod illustrated in FIG. 9 on each of the primary cell and thesecondary cell.

The mobile station apparatus 1 determines whether or not the firstuplink reference UL-DL configuration for the primary cell and the firstuplink reference UL-DL configuration for the secondary cell aredifferent from each other (S1100). If the first uplink reference UL-DLconfiguration for the primary cell and the first uplink reference UL-DLconfiguration for the secondary cell are the same as each other, themobile station apparatus 1 does not set the second uplink referenceUL-DL configuration, and finishes the setting process of the seconduplink reference UL-DL configuration.

If the first uplink reference UL-DL configuration for the primary celland the first uplink reference UL-DL configuration for the secondarycell are different from each other, the mobile station apparatus 1determines whether a serving cell is the primary cell or the secondarycell, and/or whether or not the mobile station apparatus is set tomonitor (a) PDCCH/EPDCCH including a carrier indicator field (CIF) so asto correspond to the serving cell in the other serving cell (S1102).

If the serving cell is the secondary cell, and the mobile stationapparatus is set to monitor the PDCCH/EPDCCH including the CIF so as tocorrespond to the serving cell (secondary cell) in the other servingcell (primary cell), the mobile station apparatus 1 sets the seconduplink reference UL-DL configuration for the serving cell (secondarycell) on the basis of a pair formed by the first uplink reference UL-DLconfiguration for the other serving cell (primary cell) and the firstuplink reference UL-DL configuration for the serving cell (secondarycell) (S1104).

In S1104, the mobile station apparatus 1 sets the second uplinkreference UL-DL configuration for the serving cell (secondary cell) onthe basis of a table of FIG. 10. FIG. 10 is a diagram illustrating acorrespondence between the pair formed by the first uplink referenceUL-DL configuration for the other serving cell (primary cell) and thefirst uplink reference UL-DL configuration for the serving cell(secondary cell), and the second uplink reference UL-DL configurationfor the secondary cell.

In FIG. 10, a primary cell UL-DL configuration is set by referring tothe first uplink reference UL-DL configuration for the other servingcell (primary cell). In FIG. 10, a secondary cell UL-DL configuration isset by referring to the first uplink reference UL-DL configuration forthe serving cell (secondary cell).

For example, in a case where the first uplink reference UL-DLconfiguration 0 is set for the other serving cell (primary cell), andthe first uplink reference UL-DL configuration 2 is set for the servingcell (secondary cell), the second uplink reference UL-DL configuration 1is set for the secondary cell.

If the serving cell is primary cell, or the serving cell is thesecondary cell and the mobile station apparatus 1 is not set to monitorthe PDCCH/EPDCCH including the CIF so as to correspond to the servingcell (secondary cell) in the other serving cell (primary cell), themobile station apparatus sets the first uplink reference UL-DLconfiguration for the serving cell as the second uplink reference UL-DLconfiguration for the serving cell (S1106).

The base station apparatus 3 sets the second uplink reference UL-DLconfiguration on the basis of the setting method illustrated in FIG. 9.

Monitoring the PDCCH/EPDCCH including the CIF indicates trying to decodethe PDCCH or the EPDCCH according to a DCI format including the CIF. TheCIF is a field to which a carrier indicator is mapped. A value of thecarrier indicator indicates a serving cell corresponding to a DCI formatto which the carrier indicator is related.

The mobile station apparatus 1 which is set to monitor the PDCCH/EPDCCHincluding the CIF so as to correspond to the serving cell in the otherserving cell monitors the PDCCH/EPDCCH including the CIF in the otherserving cell.

The mobile station apparatus 1 which is set to monitor the PDCCH/EPDCCHincluding the CIF so as to correspond to the serving cell in the otherserving cell preferably receives the third information for the servingcell via the PDCCH/EPDCCH.

The mobile station apparatus 1 which is not set to monitor thePDCCH/EPDCCH including the CIF so as to correspond to the serving cellin the other serving cell monitors the PDCCH/EPDCCH including the CIF ornot including the CIF in the serving cell.

The mobile station apparatus 1 which is not set to monitor thePDCCH/EPDCCH including the CIF so as to correspond to the serving cellin the other serving cell preferably receives the third information forthe serving cell via the PDCCH/EPDCCH.

The PDCCH/EPDCCH for the primary cell is transmitted in the primarycell. The third information for the primary cell is preferablytransmitted via the PDCCH/EPDCCH of the primary cell.

The base station apparatus 3 transmits, to the mobile station apparatus1, a parameter (cif-Presence-r10) indicating whether or not the CIF isincluded in a DCI format transmitted in the primary cell.

The base station apparatus 3 transmits, to the mobile station apparatus1, a parameter (CrossCarrierSchedulingConfig-r10) related to crosscarrier scheduling for each secondary cell.

The parameter (CrossCarrierSchedulingConfig-r10) includes a parameter(schedulingCellInfo-r10) indicating whether (a) PDCCH/EPDCCHcorresponding to a related secondary cell is transmitted in thesecondary cell or in the other serving cells.

In a case where the parameter (schedulingCellInfo-r10) indicates thatthe PDCCH/EPDCCH corresponding to a related secondary cell istransmitted in the secondary cell, the parameter(schedulingCellInfo-r10) includes a parameter (cif-Presence-r10)indicating whether or not the CIF is included in a DCI formattransmitted in the secondary cell.

In a case where the parameter (schedulingCellInfo-r10) indicating thatPDCCH/EPDCCH corresponding to a related secondary cell is transmitted inthe other serving cells, the parameter (schedulingCellInfo-r10) includesa parameter (schedulingCellId) indicating to which serving cell adownlink assignment for the related secondary cell is sent.

Hereinafter, a description will be made of a method of setting thesecond downlink reference UL-DL configuration.

In a case where a plurality of serving cells are set for the mobilestation apparatus 1, and the first downlink reference UL-DLconfigurations for at least two serving cells are different from eachother, the mobile station apparatus 1 and the base station apparatus 3set the second downlink reference UL-DL configuration. Except for thecase where a plurality of serving cells are set for the mobile stationapparatus 1, and the first downlink reference UL-DL configurations forat least two serving cells are different from each other, the mobilestation apparatus 1 and the base station apparatus 3 may not set thesecond downlink reference UL-DL configuration.

A case excluding the case where the first downlink reference UL-DLconfigurations for at least two serving cells are different from eachother is a case where the first downlink reference UL-DL configurationsfor all the serving cells are the same as each other. In a case where asingle serving cell is set for the mobile station apparatus 1, themobile station apparatus 1 and the base station apparatus 3 may not setthe second downlink reference UL-DL configuration.

FIG. 11 is a flowchart illustrating a method of setting the seconddownlink reference UL-DL configuration in the present embodiment. InFIG. 11, a single primary cell and a single secondary cell are set forthe mobile station apparatus 1. The mobile station apparatus 1 performsthe setting method illustrated in FIG. 11 on each of the primary celland the secondary cell.

The mobile station apparatus 1 determines whether or not the firstdownlink reference UL-DL configuration for the primary cell and thefirst downlink reference UL-DL configuration for the secondary cell aredifferent from each other (S1300). If the first downlink reference UL-DLconfiguration for the primary cell and the first downlink referenceUL-DL configuration for the secondary cell are the same as each other,the mobile station apparatus 1 does not the second downlink referenceUL-DL configuration, and finishes the setting process of the seconddownlink reference UL-DL configuration.

If the first downlink reference UL-DL configuration for the primary celland the first downlink reference UL-DL configuration for the secondarycell are different from each other, the mobile station apparatus 1determines whether a serving cell is the primary cell or the secondarycell (S1302).

If the serving cell is the secondary cell, the mobile station apparatus1 sets the second uplink reference UL-DL configuration for the servingcell (secondary cell) on the basis of a pair formed by the firstdownlink reference UL-DL configuration for the other serving cell(primary cell) and the first downlink reference UL-DL configuration forthe serving cell (secondary cell) (S1304).

In S1304, the mobile station apparatus 1 sets the second downlinkreference UL-DL configuration for the serving cell (secondary cell) onthe basis of a table of FIG. 12. FIG. 12 is a diagram illustrating acorrespondence between the pair formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell, and the seconddownlink reference UL-DL configuration for the secondary cell.

In FIG. 12, a primary cell UL-DL configuration is set by referring tothe first downlink reference UL-DL configuration for the primary cell.In FIG. 12, a secondary cell UL-DL configuration is set by referring tothe first downlink reference UL-DL configuration for the secondary cell.

In a case where the pair formed by the first downlink reference UL-DLconfiguration for the primary cell and the first downlink referenceUL-DL configuration for the secondary cell belongs to a set 1 of FIG.12, the second downlink reference UL-DL configuration for the secondarycell is defined in the set 1.

In a case where the mobile station apparatus 1 is not set to monitor (a)PDCCH/EPDCCH including the CIF so as to correspond to the secondary cellin the primary cell, and the pair formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell belongs to a set 2of FIG. 12, the second downlink reference UL-DL configuration for thesecondary cell is defined in the set 2.

In a case where the mobile station apparatus 1 is not set to monitor thePDCCH/EPDCCH including the CIF so as to correspond to the secondary cellin the primary cell, and the pair formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell belongs to a set 3of FIG. 12, the second downlink reference UL-DL configuration for thesecondary cell is defined in the set 3.

In a case where the mobile station apparatus 1 is set to monitor thePDCCH/EPDCCH including the CIF so as to correspond to the secondary cellin the primary cell, and the pair formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell belongs to a set 4of FIG. 12, the second downlink reference UL-DL configuration for thesecondary cell is defined in the set 4.

In a case where the mobile station apparatus 1 is set to monitor thePDCCH/EPDCCH including the CIF so as to correspond to the secondary cellin the primary cell, and the pair formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell belongs to a set 5of FIG. 12, the second downlink reference UL-DL configuration for thesecondary cell is defined in the set 5.

For example, in a case where the first downlink reference UL-DLconfiguration 1 is set for the primary cell, and the first downlinkreference UL-DL configuration 0 is set for the secondary cell, thesecond downlink reference UL-DL configuration 0 is set for the secondarycell.

If the serving cell is primary cell, the mobile station apparatus setsthe first downlink reference UL-DL configuration for the serving cell(primary cell) as the second uplink reference UL-DL configuration forthe serving cell (primary cell) (S1306).

In addition, the base station apparatus 3 the second downlink referenceUL-DL configuration on the basis of the setting method illustrated inFIG. 11.

Hereinafter, the first uplink reference UL-DL configuration will bedescribed.

The first uplink reference UL-DL configuration is at least used tospecify a subframe in which uplink transmission can or not be performedin a serving cell.

The mobile station apparatus 1 does not uplink transmission in asubframe which is indicated as a downlink subframe by the first uplinkreference UL-DL configuration. The mobile station apparatus 1 does notuplink transmission in a DwPTS and a GP of a subframe which is indicatedas a special subframe by the first uplink reference UL-DL configuration.

Hereinafter, the first downlink reference UL-DL configuration will bedescribed.

The first downlink reference UL-DL configuration is at least used tospecify a subframe in which downlink transmission can be performed orcannot be performed in a serving cell.

The mobile station apparatus 1 does not downlink transmission in asubframe which is indicated as an uplink subframe by the first downlinkreference UL-DL configuration. The mobile station apparatus 1 does notdownlink transmission in a UpPTS and a GP of a subframe which isindicated as a special subframe by the first downlink reference UL-DLconfiguration.

The mobile station apparatus 1 which sets the first downlink referenceUL-DL configuration on the basis of the first information may perform ameasurement (for example, a measurement regarding channel stateinformation) using a downlink signal in a downlink subframe or a DwPTSof a special subframe which is indicated by the first uplink referenceUL-DL configuration or the first downlink reference UL-DL configuration.

Therefore, in the dynamic TDD, if the base station apparatus 3 uses asubframe which is indicated as a downlink subframe by the first uplinkreference UL-DL configuration, as an uplink subframe or a specialsubframe, or uses a subframe which is indicated as a special subframe bythe first uplink reference UL-DL configuration, as an uplink subframe,there is a problem in that the mobile station apparatus 1 in which thefirst downlink reference UL-DL configuration on the basis of the firstinformation cannot appropriately perform the measurement using adownlink signal.

Thus, the base station apparatus 3 determines a downlink reference UL-DLconfiguration from a configuration set (configurations of the set) whichare restricted on the basis of the first uplink reference UL-DLconfiguration. In other words, the first downlink reference UL-DLconfiguration is an element of the configuration set which is restrictedon the basis of the first uplink reference UL-DL configuration. Theconfiguration set restricted on the basis of the first uplink referenceUL-DL configuration includes uplink reference UL-DL configurations whichsatisfy the following conditions (a) to (c). FIG. 15 is a diagramrelationship between a subframe indicated by the first uplink referenceUL-DL configuration and a subframe indicated by the first downlinkreference UL-DL configuration. In FIG. 15, D indicates a downlinksubframe, U indicates an uplink subframe, and S indicates a specialsubframe.

-   -   Condition (a): a subframe which is indicated as a downlink        subframe by the first uplink reference UL-DL configuration is        indicated as a downlink subframe.    -   Condition (b): a subframe which is indicated as an uplink        subframe by the first uplink reference UL-DL configuration is        indicated as an uplink subframe or a downlink subframe.    -   Condition (c): a subframe which is indicated as a special        subframe by the first uplink reference UL-DL configuration is        indicated as a downlink subframe or a special subframe.

Consequently, in the dynamic TDD, since a subframe which is indicated asa downlink subframe by the first uplink reference UL-DL configuration,and a DwPTS of a special subframe are not used for uplink transmission,the mobile station apparatus 1 which sets the first downlink referenceUL-DL configuration on the basis of the first information canappropriately perform a measurement using a downlink signal.

In addition, the mobile station apparatus 1 which sets the firstdownlink reference UL-DL configuration on the basis of the secondinformation may also perform a measurement (for example, a measurementregarding channel state information) using a downlink signal in adownlink subframe or a DwPTS of a special subframe indicated by thefirst uplink reference UL-DL configuration.

A subframe which is indicated as an uplink subframe by the first uplinkreference UL-DL configuration and is indicated as a downlink subframe bythe first downlink reference UL-DL configuration is also referred to asa first flexible subframe. The first flexible subframe is a subframewhich is reserved for uplink and downlink transmission.

A subframe which is indicated as a special subframe by the first uplinkreference UL-DL configuration and is indicated as a downlink subframe bythe first downlink reference UL-DL configuration is also referred to asa second flexible subframe. The second flexible subframe is a subframewhich is reserved for downlink transmission. The second flexiblesubframe is a subframe which is reserved for downlink transmission in aDwPTS and uplink transmission in a UpPTS.

Hereinafter, the transmission direction UL-DL configuration will bedescribed in detail.

If the mobile station apparatus 1 determines a transmission direction(up/down) on the basis of the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, andscheduling information (a DCI format and/or a HARQ-ACK), there is aproblem in that the mobile station apparatus 1 which wronglyreceives/decodes the scheduling information (a DCI format and/or aHARQ-ACK) transmits an uplink signal in a subframe in which the basestation apparatus 3 transmits a downlink signal to other mobile stationapparatuses 1, and thus the uplink signal interferes with the downlinksignal.

Therefore, the mobile station apparatus 1 and the base station apparatus3 of the present invention sets the transmission direction UL-DLconfiguration regarding a transmission direction (up/down) in asubframe. The transmission direction UL-DL configuration is used todetermine a transmission direction in a subframe.

The mobile station apparatus 1 controls transmission in the firstflexible subframe and the second flexible subframe on the basis of thescheduling information (a DCI format and/or a HARQ-ACK) and thetransmission direction UL-DL configuration.

The base station apparatus 3 transmits the third information indicatingthe transmission direction UL-DL configuration to the mobile stationapparatus 1. The third information is information indicating a subframein which uplink transmission can be performed. The third information isinformation indicating a subframe in which downlink transmission can beperformed. The third information is information indicating a subframe inwhich uplink transmission in the UpPTS and downlink transmission in theDwPTS can be performed.

For example, the transmission direction UL-DL configuration is used tospecify a transmission direction in a subframe which is indicated as anuplink subframe by the first uplink reference UL-DL configuration and isindicated as a downlink subframe by the first downlink reference UL-DLconfiguration, and/or a subframe which is indicated as a specialsubframe by the first uplink reference UL-DL configuration and isindicated as a downlink subframe by the first downlink reference UL-DLconfiguration. In other words, the transmission direction UL-DLconfiguration is used to specify a transmission direction in a subframewhich is indicated as a subframe different from a subframe which isindicated by the first uplink reference UL-DL configuration and thefirst downlink reference UL-DL configuration.

FIG. 14 is a diagram illustrating a relationship between a subframeindicated by the first uplink reference UL-DL configuration, a subframeindicated by the first downlink reference UL-DL configuration, and asubframe indicated by the transmission direction UL-DL configuration inthe present embodiment. In FIG. 14, D indicates a downlink subframe, Uindicates an uplink subframe, and S indicates a special subframe.

The base station apparatus 3 determines the transmission direction UL-DLconfiguration from a configuration set (configurations of the set) whichis restricted on the basis of the first uplink reference UL-DLconfiguration and the first downlink reference UL-DL configuration. Inother words, the transmission direction UL-DL configuration is anelement of the configuration set which is restricted on the basis of thefirst uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration. The configuration set which is restrictedon the basis of the first uplink reference UL-DL configuration and thefirst downlink reference UL-DL configuration includes UL-DLconfigurations which satisfy the following conditions (d) to (h).

-   -   Condition (d): a subframe which is indicated as a downlink        subframe by the first uplink reference UL-DL configuration and        the first downlink reference UL-DL configuration is indicated as        a downlink subframe.    -   Condition (e): a subframe which is indicated as an uplink        subframe by the first uplink reference UL-DL configuration and        the first downlink reference UL-DL configuration is indicated as        an uplink subframe.    -   Condition (f): a subframe which is indicated as an uplink        subframe by the first uplink reference UL-DL configuration but        is indicated as a downlink subframe by the first downlink        reference UL-DL configuration is indicated as an uplink subframe        or a downlink subframe.    -   Condition (g): a subframe which is indicated as a special        subframe by the first uplink reference UL-DL configuration and        the first downlink reference UL-DL configuration is indicated as        a special subframe.    -   Condition (h): a subframe which is indicated as a special        subframe by the first uplink reference UL-DL configuration but        is indicated as a downlink subframe by the first downlink        reference UL-DL configuration is indicated as a special subframe        or a downlink subframe.

The base station apparatus 3 may perform scheduling of downlinktransmission in a subframe which is indicated as a downlink subframe bythe transmission direction UL-DL configuration.

The mobile station apparatus 1 may perform a reception process of adownlink signal in a subframe which is indicated as a downlink subframeby the transmission direction UL-DL configuration. The mobile stationapparatus 1 may perform monitoring of the PDCCH/EPDCCH in a subframewhich is indicated as a downlink subframe by the transmission directionUL-DL configuration. The mobile station apparatus 1 may perform areception process of a PDSCH in a subframe which is indicated as adownlink subframe by the transmission direction UL-DL configuration onthe basis of detection of a downlink grant using the PDCCH/EPDCCH.

In a case where transmission of an uplink signal (PUSCH/SRS) in asubframe indicated as a downlink subframe by the transmission directionUL-DL configuration is scheduled or set, the mobile station apparatus 1does not perform a transmission process of the uplink signal (PUSCH/SRS)in the subframe.

The base station apparatus 3 may perform scheduling of uplinktransmission in a subframe which is indicated as an uplink subframe bythe transmission direction UL-DL configuration.

The base station apparatus 3 may perform scheduling of downlinktransmission in a subframe which is indicated as an uplink subframe bythe transmission direction UL-DL configuration. The base stationapparatus 3 may be prohibited from performing scheduling of downlinktransmission in a subframe which is indicated as an uplink subframe bythe transmission direction UL-DL configuration.

The mobile station apparatus 1 may perform a transmission process of anuplink signal in a subframe which is indicated as an uplink subframe bythe transmission direction UL-DL configuration. In a case wheretransmission of an uplink signal (PUSCH/DMRS/SRS) in a subframeindicated as an uplink subframe by the transmission direction UL-DLconfiguration is scheduled or set, the mobile station apparatus 1 mayperform a transmission process of the uplink signal (PUSCH/DMRS/SRS) inthe subframe.

The mobile station apparatus 1 may perform a reception process of adownlink signal in a subframe which is indicated as an uplink subframeby the transmission direction UL-DL configuration and in which uplinktransmission is not scheduled. The mobile station apparatus 1 may beprohibited from performing a reception process of a downlink signal in asubframe which is indicated as an uplink subframe by the transmissiondirection UL-DL configuration.

The base station apparatus 3 performs scheduling of downlinktransmission in a DwPTS of subframe which is indicated as a specialsubframe by the transmission direction UL-DL configuration.

The mobile station apparatus 1 may perform a reception process of adownlink signal in a DwPTS of a subframe which is indicated as a specialsubframe by the transmission direction UL-DL configuration. The mobilestation apparatus 1 may perform monitoring of the PDCCH/EPDCCH in aDwPTS of a subframe which is indicated as a special subframe by thetransmission direction UL-DL configuration. The mobile station apparatus1 may perform a reception process of a PDSCH in a DwPTS of a subframewhich is indicated as a special subframe by the transmission directionUL-DL configuration on the basis of detection of a downlink grant usingthe PDCCH/EPDCCH.

In a case where transmission of a PUSCH in a subframe indicated as aspecial subframe by the transmission direction UL-DL configuration isscheduled or set, the mobile station apparatus 1 does not perform atransmission process of the PUSCH in the subframe.

In a case where transmission of an SRS in a UpPTS of a subframeindicated as a special subframe by the transmission direction UL-DLconfiguration is scheduled or set, the mobile station apparatus 1 mayperform a transmission process of the SRS in the UpPTS of the subframe.

FIG. 15 is a diagram illustrating a relationship between the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration.

For example, in FIG. 15, in a case where the first uplink referenceUL-DL configuration is 0, the first downlink reference UL-DLconfiguration is one of a set {0, 1, 2, 3, 4, 5, 6}. For example, inFIG. 15, in a case where the first uplink reference UL-DL configurationis 1, the first downlink reference UL-DL configuration is one of a set{1, 2, 4, 5}.

For example, in FIG. 15, in a case where the first uplink referenceUL-DL configuration is 0, and the first downlink reference UL-DLconfiguration is 1, the transmission direction UL-DL configuration isone of a set {0, 1, 6}.

In addition, a value of the first downlink reference UL-DL configurationmay be the same as a value of the first uplink reference UL-DLconfiguration. However, in order for the mobile station apparatus 1which has not received the second information to set the same value as avalue of the first uplink reference UL-DL configuration as the firstdownlink reference UL-DL configuration, a value of the first downlinkreference UL-DL configuration indicated by the second information is notpreferably the same as a value of the first uplink reference UL-DLconfiguration indicated by the first information.

In a case where a value of the first uplink reference UL-DLconfiguration is the same as a value of the first downlink referenceUL-DL configuration, the transmission direction UL-DL configuration maynot be defined. Alternatively, in a case where a value of the firstuplink reference UL-DL configuration is the same as a value of the firstdownlink reference UL-DL configuration, the same value as the value ofthe first uplink reference UL-DL configuration and the value of thefirst downlink reference UL-DL configuration may be set as thetransmission direction UL-DL configuration.

In addition, as a configuration set which is restricted on the basis ofthe first uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration, a configuration set (configurations ofthe set) which is constituted by UL-DL configurations of the firstuplink reference UL-DL configuration and UL-DL configurations of thefirst downlink reference UL-DL configuration may be used.

For example, in a case where the first uplink reference UL-DLconfiguration is 0, and the first downlink reference UL-DL configurationis 1, a configuration set which is restricted on the basis of the firstuplink reference UL-DL configuration and the first downlink referenceUL-DL configuration is {0, 1}. In this case, the third informationpreferably has 1 bit.

The third information may be information indicating the transmissiondirection UL-DL configuration (configurations of the set) from theconfiguration set constituted by the first uplink reference UL-DLconfiguration and the first downlink reference UL-DL configuration.

Hereinafter, the first uplink reference UL-DL configuration and thesecond uplink reference UL-DL configuration will be described in detail.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select, determine) acorrespondence between a subframe n in which the PDCCH/EPDCCH/PHICH isallocated and a subframe n+k in which the PUSCH corresponding to thePDCCH/EPDCCH/PHICH is allocated.

In a case where a single primary cell is set, or in a case where asingle primary cell and a single secondary cell are set, and the firstuplink reference UL-DL configuration for the primary cell is the same asthe first uplink reference UL-DL configuration for the secondary cell, acorresponding first uplink reference UL-DL configuration is used todetermine a correspondence between a subframe in which thePDCCH/EPDCCH/PHICH is allocated and a subframe in which the PUSCHcorresponding to the PDCCH/EPDCCH/PHICH is allocated in each of the twoserving cells.

In a case where a single primary cell and a single secondary cell areset, and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, a corresponding second uplink reference UL-DLconfiguration is used to determine a correspondence between a subframein which the PDCCH/EPDCCH/PHICH is allocated and a subframe in which thePUSCH corresponding to the PDCCH/EPDCCH/PHICH is allocated in each ofthe two serving cells.

FIG. 16 is a diagram illustrating a correspondence between the subframen in which the PDCCH/EPDCCH/PHICH is allocated and the PUSCHcorresponding to the PDCCH/EPDCCH/PHICH is allocated in the presentembodiment. The mobile station apparatus 1 specifies (selects,determines) a value of k on the basis of a table of FIG. 16.

In FIG. 16, in a case where a single primary cell is set, or in a casewhere a single primary cell and a single secondary cell are set, and thefirst uplink reference UL-DL configuration for the primary cell is thesame as the first uplink reference UL-DL configuration for the secondarycell, an uplink-downlink configuration is set by referring to the firstuplink reference UL-DL configuration.

In FIG. 16, in a case where a single primary cell and a single secondarycell are set, and the first uplink reference UL-DL configuration for theprimary cell is different from the first uplink reference UL-DLconfiguration for the secondary cell, an uplink-downlink configurationis set by referring to the second uplink reference UL-DL configuration.

Hereinafter, in description of FIG. 16, the first uplink reference UL-DLconfiguration and the second uplink reference UL-DL configuration aresimply referred to as an uplink-downlink configuration.

In a case where the mobile station apparatus 1 detects the PDCCH/EPDCCHand including an uplink grant which corresponds to a serving cell forwhich uplink-downlink configurations of 1 to 6 and targets the mobilestation apparatus 1 in the subframe n, the PUSCH corresponding to theuplink grant is transmitted in the subframe n+k which is specified(selected, determined) on the basis of the table of FIG. 16.

In a case where the mobile station apparatus 1 detects the PHICHincluding a NACK which corresponds to a serving cell for whichuplink-downlink configurations of 1 to 6 and targets the mobile stationapparatus 1 in the subframe n, the PUSCH corresponding to the uplinkgrant is transmitted in the subframe n+k which is specified (selected,determined) on the basis of the table of FIG. 16.

An uplink grant which corresponds to a serving cell for which theuplink-downlink configuration 0 is set and targets the mobile stationapparatus 1 includes a 2-bit uplink index (UL index). An uplink grantcorresponds to a serving cell for which the uplink-downlinkconfigurations 1 to 5 are set and targets the mobile station apparatus 1does not include the uplink index (UL index).

In a case where 1 is set to a most significant bit (MSB) of an uplinkindex included in the uplink grant corresponding to a serving cell forwhich the uplink-downlink configuration 0 is set in the subframe n, themobile station apparatus 1 adjusts transmission of the PUSCHcorresponding to the uplink grant in the subframe n+k which is specified(selected, determined) on the basis of the table of FIG. 16.

In a case where the mobile station apparatus 1 receives a PHICHincluding the NACK corresponding to a serving cell for which theuplink-downlink configuration 0 is set in a first resource set of thesubframe n=0 or 5, the mobile station apparatus 1 adjusts transmissionof the PUSCH corresponding to the PHICH in the subframe n+k which isspecified (selected, determined) on the basis of the table of FIG. 16.

In a case where 1 is set to a least significant bit (LSB) of an uplinkindex included in the uplink grant corresponding to a serving cell forwhich the uplink-downlink configuration 0 is set in the subframe n, themobile station apparatus 1 adjusts transmission of the PUSCHcorresponding to the uplink grant in the subframe n+7.

In a case where the mobile station apparatus 1 receives a PHICHincluding the NACK corresponding to a serving cell for which theuplink-downlink configuration 0 is set in a second resource set of thesubframe n=0 or 5, the mobile station apparatus 1 adjusts transmissionof the PUSCH corresponding to the uplink grant in the subframe n+7.

In a case where the mobile station apparatus 1 receives a PHICHincluding the NACK corresponding to a serving cell for which theuplink-downlink configuration 0 is set in the subframe n=1 or 5, themobile station apparatus 1 adjusts transmission of the PUSCHcorresponding to the uplink grant in the subframe n+7.

For example, in a case where the mobile station apparatus 1 detects aPDCCH, an EPDCCH, or a PHICH corresponding to a serving cell for whichthe uplink-downlink configuration 0 is set in [SFN=m, subframe 1], themobile station apparatus adjusts transmission of the PUSCH in [SFN=m,subframe 7] which is six subframes later than the subframe.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select, determine) acorrespondence between the subframe n in which the PHICH is allocatedand the subframe n−k in which the PUSCH corresponding to the PHICH isallocated.

In a case where a single primary cell is set, or in a case where asingle primary cell and a single secondary cell are set, and the firstuplink reference UL-DL configuration for the primary cell is the same asthe first uplink reference UL-DL configuration for the secondary cell, acorresponding first uplink reference UL-DL configuration is used tospecify (select, determine) a correspondence between the subframe n inwhich the PHICH is allocated and the subframe n−k in which the PUSCHcorresponding to the PHICH is allocated in each of the two servingcells.

In a case where a single primary cell and a single secondary cell areset, and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, a corresponding first uplink reference UL-DLconfiguration is used to specify (select, determine) a correspondencebetween the subframe n in which the PHICH is allocated and the subframen−k in which the PUSCH corresponding to the PHICH is allocated in eachof the two serving cells.

FIG. 17 is a diagram illustrating a correspondence between the subframen in which the PHICH is allocated and the subframe n−k in which thePUSCH corresponding to the PHICH is allocated in the present embodiment.The mobile station apparatus 1 specifies (selects, determines) a valueof k on the basis of a table of FIG. 17.

In FIG. 17, in a case where a single primary cell is set, or in a casewhere a single primary cell and a single secondary cell are set, and thefirst uplink reference UL-DL configuration for the primary cell is thesame as the first uplink reference UL-DL configuration for the secondarycell, an uplink-downlink configuration is set by referring to the firstuplink reference UL-DL configuration.

In FIG. 17, in a case where a single primary cell and a single secondarycell are set, and the first uplink reference UL-DL configuration for theprimary cell is different from the first uplink reference UL-DLconfiguration for the secondary cell, an uplink-downlink configurationis set by referring to the second uplink reference UL-DL configuration.

Hereinafter, in description of FIG. 17, the first uplink reference UL-DLconfiguration and the second uplink reference UL-DL configuration aresimply referred to as an uplink-downlink configuration.

Regarding a serving cell for the uplink-downlink configurations 1 to 6are set, a HARQ indicator (HARQ-ACK) which is received via a PHICHcorresponding to the serving cell in the subframe n is related totransmission of a PUSCH in the subframe n−k which is specified on thebasis of the table of FIG. 17.

Regarding a serving cell for the uplink-downlink configuration 0 is set,a HARQ indicator (HARQ-ACK) which is received via a PHICH correspondingto the serving cell in a first resource set of the subframe n=0 or 5, orin the subframes n=1 or 6, is related to transmission of a PUSCH in thesubframe n−k which is specified on the basis of the table of FIG. 17.

Regarding a serving cell for the uplink-downlink configuration 0 is set,a HARQ indicator (HARQ-ACK) which is received via a PHICH correspondingto the serving cell in a second resource set of the subframe n=0 or 5 isrelated to transmission of a PUSCH in the subframe n−6.

For example, regarding a serving cell for which the uplink-downlinkconfiguration 1 is set, a HARQ indicator (HARQ-ACK) which is receivedvia the PHICH in [SFN=m, subframe 1] is related to transmission of thePUSCH in [SFN=m−1, subframe 7] which is four subframes earlier than thesubframe.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select, determine) acorrespondence between the subframe n in which a PUSCH is allocated andthe subframe n+k in which a PHICH corresponding to the PUSCH isallocated.

In a case where a single primary cell is set, or in a case where asingle primary cell and a single secondary cell are set, and the firstuplink reference UL-DL configuration for the primary cell is the same asthe first uplink reference UL-DL configuration for the secondary cell, acorresponding first uplink reference UL-DL configuration is used tospecify (select, determine) a correspondence between the subframe n inwhich the PUSCH is allocated and the subframe n+k in which the PHICHcorresponding to the PUSCH is allocated in each of the two servingcells.

In a case where a single primary cell and a single secondary cell areset, and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, a corresponding second uplink reference UL-DLconfiguration is used to specify (select, determine) a correspondencebetween the subframe n in which the PUSCH is allocated and the subframen+k in which the PHICH corresponding to the PUSCH is allocated in eachof the two serving cells.

FIG. 18 is a diagram illustrating a correspondence between the subframen in which the PUSCH is allocated and the subframe n+k in which thePHICH corresponding to the PUSCH is allocated in the present embodiment.The mobile station apparatus 1 specifies (selects, determines) a valueof k on the basis of a table of FIG. 18.

In FIG. 18, in a case where a single primary cell is set, or in a casewhere a single primary cell and a single secondary cell are set, and thefirst uplink reference UL-DL configuration for the primary cell is thesame as the first uplink reference UL-DL configuration for the secondarycell, an uplink-downlink configuration is set by referring to the firstuplink reference UL-DL configuration.

In FIG. 18, in a case where a single primary cell and a single secondarycell are set, and the first uplink reference UL-DL configuration for theprimary cell is different from the first uplink reference UL-DLconfiguration for the secondary cell, an uplink-downlink configurationis set by referring to the second uplink reference UL-DL configuration.

Hereinafter, in description of FIG. 18, the first uplink reference UL-DLconfiguration and the second uplink reference UL-DL configuration aresimply referred to as an uplink-downlink configuration.

In a case where transmission of the PUSCH is scheduled in the subframen, the mobile station apparatus 1 determines a PHICH resource in thesubframe n+k which is specified on the basis of the table of FIG. 18.

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=2], a PHICH resource is determined in[SFN=m, subframe n=6].

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=3], a PHICH resource is determined froma first resource set in [SFN=m+1, subframe n=0].

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=4], a PHICH resource is determined froma second resource set in [SFN=m+1, subframe n=0].

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=7], a PHICH resource is determined in[SFN=m+1, subframe n=1].

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=8], a PHICH resource is determined froma first resource set in [SFN=m+1, subframe n=5].

For example, regarding a serving cell for which the uplink-downlinkconfiguration 0 is set, in a case where transmission of the PUSCH isscheduled in [SFN=m, subframe n=9], a PHICH resource is determined froma second resource set in [SFN=m+1, subframe n=5].

Hereinafter, the first downlink reference UL-DL configuration and thesecond downlink reference UL-DL configuration will be described indetail.

The first downlink reference UL-DL configuration and the second downlinkreference UL-DL configuration are used to specify (select, determine) acorrespondence between the subframe n in which a PDSCH is allocated andthe subframe n+k in which a HARQ-ACK corresponding to the PDSCH istransmitted.

In a case where a single primary cell is set, or in a case where asingle primary cell and a single secondary cell are set, and the firstdownlink reference UL-DL configuration for the primary cell is the sameas the first downlink reference UL-DL configuration for the secondarycell, a corresponding first downlink reference UL-DL configuration isused to specify (select, determine) a correspondence between thesubframe n in which the PDSCH is allocated and the subframe n+k in whicha HARQ-ACK corresponding to the PDSCH is transmitted in each of the twoserving cells.

In a case where a single primary cell and a single secondary cell areset, and the first downlink reference UL-DL configuration for theprimary cell is different from the first downlink reference UL-DLconfiguration for the secondary cell, a corresponding second downlinkreference UL-DL configuration is used to specify (select, determine) acorrespondence between the subframe n in which the PDSCH is allocatedand the subframe n+k in which a HARQ-ACK corresponding to the PDSCH istransmitted in each of the two serving cells.

FIG. 19 is a diagram illustrating a correspondence between the subframen+k in which the PDSCH is allocated and the subframe n in which aHARQ-ACK corresponding to the PDSCH is transmitted in each of the twoserving cells. The mobile station apparatus 1 specifies (selects,determines) a value of k on the basis of a table of FIG. 19.

In FIG. 19, in a case where a single primary cell is set, or in a casewhere a single primary cell and a single secondary cell are set, and thefirst downlink reference UL-DL configuration for the primary cell is thesame as the first downlink reference UL-DL configuration for thesecondary cell, an uplink-downlink configuration is set by referring tothe first downlink reference UL-DL configuration.

In FIG. 19, in a case where a single primary cell is set, or in a casewhere a single primary cell and a single secondary cell are set, and thefirst downlink reference UL-DL configuration for the primary cell is thesame as the first downlink reference UL-DL configuration for thesecondary cell, an uplink-downlink configuration is set by referring tothe second downlink reference UL-DL configuration.

Hereinafter, in description of FIG. 19, the first downlink referenceUL-DL configuration and the second downlink reference UL-DLconfiguration are simply referred to as an uplink-downlinkconfiguration.

In a case where the mobile station apparatus 1 detects transmission ofthe PDSCH in which transmission of a corresponding HARQ-ACK targetingthe mobile station apparatus 1 is to be transmitted in a subframe n−k (kis specified on the basis of the table of FIG. 19) for a serving cell,the HARQ-ACK is transmitted in the subframe n.

For example, the mobile station apparatus 1 does not make a response ofthe HARQ-ACK to transmission of the PDSCH which is used to transmitsystem information. For example, the mobile station apparatus 1 makes aresponse of the HARQ-ACK to transmission of the PDSCH which is scheduledby a DCI format including the CRC scrambled with the C-RNTI.

For example, the mobile station apparatus 1 performs transmission of theHARQ-ACK of the PDSCH received in the subframe n−6 and/or n−7 for aserving cell for which the uplink-downlink configuration 1 is set, inthe subframe n=2.

In addition, in a case where the first uplink reference UL-DLconfiguration is set, and the first downlink reference UL-DLconfiguration and the transmission direction UL-DL configuration are notset, the mobile station apparatus 1 may specify (select, determine) atransmission direction (up/down) on the basis of the first uplinkreference UL-DL configuration.

Further, in a case where the first uplink reference UL-DL configurationand the first downlink reference UL-DL configuration are set, and thetransmission direction UL-DL configuration is not set, the mobilestation apparatus 1 may specify (select, determine) a transmissiondirection (up/down) on the basis of the first downlink reference UL-DLconfiguration.

Further, the first downlink reference UL-DL configuration may not bedefined for a serving cell which has not received the secondinformation. In this case, the mobile station apparatus 1 and the basestation apparatus 3 may perform the above-described process performed onthe basis of the first downlink reference UL-DL configuration, on thebasis of the first uplink reference UL-DL configuration (serving cellUL-DL configuration). A serving cell which has not received the secondinformation is a serving cell for which the dynamic TDD is not set.

For example, in a case where a single primary cell and a singlesecondary cell are set; the second information for the primary cell hasnot been received; the second information for the secondary cell hasbeen received; the first uplink reference UL-DL configuration (servingcell UL-DL configuration) for the primary cell is different from thefirst downlink reference UL-DL configuration for the secondary cell; anda serving cell is the secondary cell, the second downlink referenceUL-DL configuration may be set on the basis of a pair formed by thefirst uplink reference UL-DL configuration for the other serving cell(primary cell) and the first downlink reference UL-DL configuration forthe serving cell (secondary cell).

For example, in a case where a single primary cell and a singlesecondary cell are set; the second information for the primary cell hasnot been received; the second information for the secondary cell hasbeen received; the first uplink reference UL-DL configuration (servingcell UL-DL configuration) for the primary cell is different from thefirst downlink reference UL-DL configuration for the secondary cell; anda serving cell is the secondary cell, a corresponding second downlinkreference UL-DL configuration may be used to specify (select, determine)a correspondence between the subframe n in which the PDSCH is allocatedand the subframe n+k in which a HARQ-ACK corresponding to the PDSCH istransmitted in each of the two serving cells.

For example, in a case where a single primary cell and a singlesecondary cell are set; the second information for the primary cell hasnot been received; the second information for the secondary cell hasbeen received; and the first uplink reference UL-DL configuration(serving cell UL-DL configuration) for the primary cell is the same asthe first downlink reference UL-DL configuration for the secondary cell,a corresponding first uplink reference UL-DL configuration may be usedto specify (select, determine) a correspondence between the subframe nin which the PDSCH is allocated and the subframe n+k in which a HARQ-ACKcorresponding to the PDSCH is transmitted in the primary cell, and acorresponding first downlink reference UL-DL configuration may be usedto specify (select, determine) a correspondence between the subframe nin which the PDSCH is allocated and the subframe n+k in which a HARQ-ACKcorresponding to the PDSCH is transmitted in the secondary cell.

For example, in a case where a single primary cell and a singlesecondary cell are set; the second information for the primary cell hasnot been received; the second information for the secondary cell hasbeen received; and the first uplink reference UL-DL configuration(serving cell UL-DL configuration) for the primary cell is differentfrom the first downlink reference UL-DL configuration for the secondarycell, a primary cell UL-DL configuration is set by referring to thefirst uplink reference UL-DL configuration for the primary cell in FIGS.10 and 12.

Hereinafter, CSI reporting of the present invention will be described.

As described above, a downlink reference signal is used to measurechannel state information (CSI) of a downlink. Particularly, the NZPCSI-RS is used for the mobile station apparatus 1 to calculate channelstate information of a downlink. In addition, a resource of the ZPCSI-RS is set by the base station apparatus 3. The base stationapparatus 3 transmits the ZP CSI-RS with zero output, and, for example,the mobile station apparatus 1 can measure interference with a resourcecorresponding to the NZP CSI-RS in a certain cell. The mobile stationapparatus 1 computes the NZP CSI-RS and a channel quality indicator(CQI) included in the CSI by the NZP CSI-RS. Further, an index of theCQI corresponds to a modulation method and a transport block size of aPDSCH. The mobile station apparatus 1 calculates an index of the CQIcorresponding to a combination which causes an error rate of thetransport block not to exceed a predetermined value (for example, 0.1).The CSI may include a rank indicator (RI), a precoding matrix indicator(PMI), or a precoding type indicator (PTI). The measured and calculatedCSI is reported to the base station apparatus 3 through periodic CSIreporting or aperiodic CSI reporting by using a PUCCH or a PUSCH.

Hereinafter, a description will be made of a reporting method in a casewhere a periodic CSI is used in the present invention.

In a case where simultaneous transmission of a PUSCH and a PUCCH is notset, the periodic CSI is transmitted by using the PUCCH in a subframe towhich the PUSCH is not assigned.

In a case where the simultaneous transmission of the PUSCH and the PUCCHis not set, the periodic CSI is transmitted in a subframe to which thePUSCH is assigned, by using the PUSCH of a serving cell in which a givenparameter ServeCellIndex of a high layer is the smallest value.

The periodic CSI is transmitted with a system frame number and a slotnumber satisfying the following Equation 1.

(10×n _(f) +└n _(s)/2┘−N _(OFFSET,CQI))mod(N _(pd))=0  [Math 1]

Here, n_(f) indicates a system frame number, and n_(s) indicates a slotnumber in a system frame. In addition, N_(OFFSET,CQI) indicates a timingoffset, and N_(pd) indicates the reporting periodicity of the periodicCSI, both of which are respectively set through signaling by a highlayer on the basis of a table illustrated in FIG. 20 in the TDD. In FIG.20, I_(CQI/PMI) is a parameter of which a notification is sent by a highlayer, and the mobile station apparatus 1 having received thenotification of the parameter specifies (selects, determines) aperiodicity N_(pd) and a timing offset N_(OFFSET,CQI) of the periodicCSI by using the table of FIG. 20. As an example, in the case whereI_(CQI/PMI) of which a notification is sent by a high layer is 3, it canbe seen from the table of FIG. 20 that periodicity N_(pd) is 5, andN_(OFFSET,CQI) is 2. Therefore, if these values are assigned to Equation1, it is possible to specify that the periodic CSI is transmitted with asystem frame number and a slot number satisfying the following Equation2.

(10×n _(f) +└n _(s)/2┘−2)mod 5=0  [Math 2]

Therefore, as illustrated in FIG. 21, the periodic CSI is transmitted infifth and sixth (n_(s)=4 and 5) slots (the subframe #2) and fifteenthand sixteenth (n_(s)=14 and 15) slots (the subframe #7) of each systemframe.

The periodic CSI is transmitted as a UL signal in the designatedsubframes via a PUCCH or a PUSCH, but in a case where the transmittedperiodic CSI and a DL signal for any mobile station apparatus aretransmitted in the same subframe, the two signals interfere with eachother, and this causes deterioration in each signal. Therefore, in thepresent embodiment, a periodicity for transmitting the periodic CSI isrestricted by using the first downlink reference UL-DL configuration.

Hereinafter, a description will be made of a case where the periodicityfor transmitting the periodic CSI is determined on the basis of thefirst downlink reference UL-DL configuration. FIG. 22 illustratesconfigurations of a downlink subframe, a special subframe, and an uplinksubframe, and supported reporting periodicities of the periodic CSI inthe configurations in the first downlink reference UL-DL configuration.In the present embodiment, the mobile station apparatus 1 can report theperiodic CSI only in the uplink subframe hatched in FIG. 22. For thisreason, for example, in a case where the first downlink reference UL-DLconfiguration is 2, an uplink subframe is present every five subframes,and thus a supported reporting periodicity of the periodic CSI is 5 msor more, and a reporting periodicity of 1 ms is not necessary.Similarly, in a case where the first downlink reference UL-DLconfiguration is 3, an uplink subframe is present after one or twosubframes, but a downlink subframe is necessary to be present after fivesubframes, and thus a reporting periodicity of 5 ms is not necessary.Thus, a periodicity for transmitting the periodic CSI is restricted asfollows on the basis of the first downlink reference UL-DLconfiguration.

(1) The periodic CSI reporting periodicity N_(pd)=1 is applicable onlyif the first downlink reference UL-DL configuration belongs to 0, 1, 3,4 and 6, and the periodic CSI is transmitted in a case where a subframeis an uplink subframe indicated by the first downlink reference UL-DLconfiguration.

(2) The periodic CSI reporting periodicity N_(pd)=5 is applicable onlyif the first downlink reference UL-DL configuration belongs to 0, 1, 2and 6. However, in a case where the first downlink reference UL-DLconfiguration is 6, the reporting periodicity may be applicable onlywhen the timing offset N_(OFFSET,CQI) is 2 or 3.

(3) The periodic CSI reporting periodicity N_(pd)=10, 20, 40, 80, and160 are applicable for all of the first downlink reference UL-DLconfigurations.

In addition, even a periodicity supported on the basis of the firstdownlink reference UL-DL configuration may be excluded in a case where asubframe designated by the timing offset N_(OFFSET,CQI) is a downlinksubframe indicated by the first downlink reference UL-DL configurationat all times. For example, it is assumed that the periodic CSI reportingperiodicity of 5 ms is designated in a case where the first downlinkreference UL-DL configuration is 0. In this case, if the timing offset 0is designated, corresponding subframes (the subframes #0 and #5) aredownlink subframes indicated by the first downlink reference UL-DLconfiguration at all times, and thus the periodic CSI which is an uplinksignal cannot be transmitted. In the same manner for a case of thetiming offset 1, corresponding subframes (the subframes #1 and #6) arespecial subframes indicated by the first downlink reference UL-DLconfiguration at all times, and thus the periodic CSI cannot betransmitted at all times in a case where the periodic CSI cannot betransmitted in the special subframe indicated by the first downlinkreference UL-DL configuration. Therefore, in a case where the firstdownlink reference UL-DL configuration is 0, the timing offsetN_(OFFSET,CQI) is preferably selected from among 2, 3, and 4, and isset.

As described above, in the present invention, the base station apparatus3 restricts a reporting periodicity and/or a timing offset of theperiodic CSI which is reported by the mobile station apparatus 1 on thebasis of the first downlink reference UL-DL configuration of which anotification is sent to the mobile station apparatus 1.

In addition, the mobile station apparatus 1 restricts an applicablereporting periodicity and/or a timing offset of the periodic CSI on thebasis of the first downlink reference UL-DL configuration of which anotification is sent from the base station apparatus 3. The mobilestation apparatus 1 may perform predetermined error handling in a casewhere a reporting periodicity and/or a timing offset of which anotification is sent via a high layer is not an applicable value/are notapplicable values. Further, the predetermined error handling may beperformed in the high layer.

As an example of the predetermined error handling, in a case where areporting periodicity and/or a timing offset of the periodic CSI, ofwhich a notification is sent, are (is) not an applicable value, themobile station apparatus 1 discards the value.

As another example of the predetermined error handling, in a case wherea reporting periodicity and/or a timing offset of the periodic CSI, ofwhich a notification is sent, is not an applicable value, the mobilestation apparatus 1 requests the base station apparatus 3 to transmit areporting periodicity and/or a timing offset of the periodic CSI again.

As another example of the predetermined error handling, in a case wherea reporting periodicity and/or a timing offset of the periodic CSI, ofwhich a notification is sent, is not an applicable value, the mobilestation apparatus 1 selects and uses a value from among applicablevalues according to a predetermined rule.

As mentioned above, a description has been made of a case where aperiodicity and/or a timing off for transmitting the periodic CSI are(is) restricted on the basis of the first downlink reference UL-DLconfiguration, but the method is also effective in a case where aplurality of serving cells are set for the mobile station apparatus 1.In this case, UE restricts a periodicity and/or a timing offset fortransmitting the periodic CSI on the basis of the first downlinkreference UL-DL configuration for a primary cell.

In addition, in a case where the second information has been received,the mobile station apparatus 1 restricts a periodicity and/or a timingfor transmitting the periodic CSI on the basis of the first downlinkreference UL-DL configuration which is set on the basis of the secondinformation. In a case where the second information has not beenreceived, the mobile station apparatus 1 restricts a periodicity and/ora timing offset for transmitting the periodic CSI on the basis of thefirst downlink reference UL-DL configuration which is set on the basisof the first information. This will be described in detail withreference to a flowchart illustrated in FIG. 23. The mobile stationapparatus 1 determines whether or not the second information for aprimary cell has been received (S1400). If the second information forthe primary cell has been received, the mobile station apparatus 1 setsthe first downlink reference UL-DL configuration for the primary cell onthe basis of the second information for the primary cell (S1401). If thesecond information for the primary cell has not been received(else/otherwise), the mobile station apparatus 1 sets the first downlinkreference UL-DL configuration for the primary cell on the basis of thefirst information for the primary cell (S1402). The mobile stationapparatus 1 restricts a reporting periodicity and/or a timing offset ofthe periodic CSI on the basis of the first downlink reference UL-DLconfiguration for the primary cell which is set in S1401 or S1402(S1403).

However, the method is described on the premise that the mobile stationapparatus 1 transmits the periodic CSI via the PUCCH only in a primarycell, but another method is employed in a case where the mobile stationapparatus 1 transmits the periodic CSI via the PUCCH in a secondarycell. For example, the mobile station apparatus 1 may receive the secondinformation for a secondary cell, set the first downlink reference UL-DLconfiguration for the secondary cell on the basis of the secondinformation, and restrict a reporting periodicity and/or a timing offsetof the periodic CSI which is transmitted via the PUCCH of the secondarycell on the basis of the first downlink reference UL-DL configurationfor the secondary cell. For example, the mobile station apparatus 1 mayrestrict a reporting periodicity and/or a timing offset of the periodicCSI which is transmitted via the PUCCH of the primary cell and/or thesecondary cell on the basis of the first downlink reference UL-DLconfiguration for the primary cell and the first downlink referenceUL-DL configuration for the secondary cell.

FIG. 24 is a schematic block diagram illustrating a configuration of themobile station apparatus 1 according to the present embodiment. Asillustrated in FIG. 7, the mobile station apparatus 1 includes a higherlayer processing unit 101, a control unit 103, a reception unit 105, atransmission unit 107, and a transmit and receive antenna 109.

In addition, the higher layer processing unit 101 includes a radioresource control portion 1011, a subframe setting portion 1013, ascheduling information analysis portion 1015, and a CSI transmissioncontrol portion 1017. Further, the reception unit 105 includes adecoding portion 1051, a demodulation portion 1053, a demultiplexingportion 1055, a radio reception portion 1057, and a channel measurementportion 1059. Furthermore, the transmission unit 107 includes a codingportion 1071, a modulation portion 1073, a multiplexing portion 1075, aradio transmission portion 1077, and an uplink reference signalgeneration portion 1079.

The higher layer processing unit 101 outputs uplink data (transportblock) which is generated according to a user's operation or the like,to the transmission unit 107. In addition, the higher layer processingunit 101 performs processes on a medium access control (MAC) layer, apacket data convergence protocol (PDCP) layer, a radio link control(RLC) layer, and a radio resource control (RRC) layer.

The radio resource control portion 1011 of the higher layer processingunit 101 manages various items for setting information of the terminal.In addition, the radio resource control portion 1011 generatesinformation which is to be mapped in each channel of an uplink, andoutputs the information to the transmission unit 107.

The subframe setting portion 1013 of the higher layer processing unit101 manages a first uplink reference UL-DL configuration (uplinkreference configuration), a first downlink reference UL-DL configuration(downlink reference configuration), a second uplink reference UL-DLconfiguration, a second downlink reference UL-DL configuration, and atransmission direction UL-DL configuration (transmission directionconfiguration).

The subframe setting portion 1013 sets the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and the transmission direction UL-DLconfiguration.

The scheduling information analysis portion 1015 of the higher layerprocessing unit 101 analyzes a DCI format (scheduling information) whichis received via the reception unit 105, generates control informationfor controlling the reception unit 105 and the transmission unit 107 onthe basis of a result of analyzing the DCI format, and outputs thecontrol information to the control unit 103.

The scheduling information analysis portion 1015 also determines timingsfor performing a transmission process and a reception process on thebasis of the first uplink reference UL-DL configuration, the firstdownlink reference UL-DL configuration, the second uplink referenceUL-DL configuration, the second downlink reference UL-DL configuration,and/or the transmission direction UL-DL configuration.

The CSI transmission control portion 1017 reads a parameter indicating areporting periodicity and/or a timing offset of the periodic CSI fromRRC parameters of which a notification is sent from the base stationapparatus 3 via an RRC layer, and specifies (selects, determines) asubframe in which the periodic CSI is transmitted.

The CSI transmission control portion 1017 restricts a subframe used totransmit the periodic CSI on the basis of the first downlink referenceUL-DL configuration which is set by the subframe setting portion 1013.For example, in a case where a reporting periodicity and/or a timingoffset of the periodic CSI, set by the RRC parameter, cannot be used inthe set first downlink reference UL-DL configuration, the CSItransmission control portion 1017 performs the above-described errorhandling.

The CSI transmission control portion 1017 inserts channel stateinformation measured by the channel measurement portion 1059 into aPUCCH or a PUSCH in a subframe in which the periodic CSI is transmitted,and outputs the PUCCH or the PUSCH to the transmission unit 107.

The control unit 103 generates control signals for controlling thereception unit 105 and the transmission unit 107 on the basis of thecontrol information from the higher layer processing unit 101. Thecontrol unit 103 outputs the generated control signals to the receptionunit 105 and the transmission unit 107 so as to control the receptionunit 105 and the transmission unit 107.

The reception unit 105 demultiplexes, demodulates and decodes a receivedsignal which is received from the base station apparatus 3 via thetransmit and receive antenna 109, in response to the control signalwhich is input from the control unit 103, and outputs the decodedinformation to the higher layer processing unit 101.

The radio reception portion 1057 converts (down-converts) a downlinksignal which is received via the transmit and receive antenna 109 intoan intermediate frequency so as to remove unnecessary frequencycomponents, controls an amplification level so that a signal level isappropriately maintained, orthogonally demodulates the received signalon the basis of an in-phase component and an orthogonal componentthereof, and converts the orthogonally demodulated analog signal into adigital signal. The radio reception portion 1057 removes a portioncorresponding to a guard interval (GI) from the converted digitalsignal, and performs fast Fourier transform (FFT) on the signal fromwhich the guard interval is removed, so as to extract a signal of thefrequency domain.

The demultiplexing portion 1055 demultiplexes the extracted signal intothe PHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. Further, the demultiplexing portion 1055 compensates forchannels such as the PHICH, the PDCCH, the EPDCCH, and the PDSCH on thebasis of channel estimation values which are input from the channelmeasurement portion 1059. Furthermore, the demultiplexing portion 1055outputs the demultiplexed downlink reference signal to the channelmeasurement portion 1059.

The demodulation portion 1053 multiplies and combines the PHICH by andwith a corresponding sign, demodulates the combined signal in a binaryphase shift keying (BPSK) modulation method, and outputs an obtainedsignal to the decoding portion 1051. The decoding portion 1051 decodesthe PHICH directed to the mobile station apparatus, and outputs adecoded HARQ indicator to the higher layer processing unit 101. Thedemodulation portion 1053 demodulates the PDCCH and/or the EPDCCH in aQPSK modulation method, and outputs an obtained result to the decodingportion 1051. In a case where the decoding portion 1051 tries to decodethe PDCCH and/or the EPDCCH and succeeds in the decoding, and thedecoding portion outputs decoded downlink control information and RNTIcorresponding to the downlink control information to the higher layerprocessing unit 101.

The demodulation portion 1053 demodulates the PDSCH using a modulationmethod such as quadrature phase shift keying (QPSK), 16 quadratureamplitude modulation (QAM), or 64 QAM, of which a notification is sentin a downlink grant, and outputs an obtained result to the decodingportion 1051. The decoding portion 1051 performs decoding on the basisof information regarding a coding rate of which a notification has beensent with the downlink control information, and outputs decoded downlinkdata (transport block) to the higher layer processing unit 101.

The channel measurement portion 1059 measures path loss of a downlink ora channel state on the basis of the downlink reference signal which isinput from the demultiplexing portion 1055, and outputs the measuredpath loss or channel state to the higher layer processing unit 101. Inaddition, the channel measurement portion 1059 calculates a channelestimation value of the downlink on the basis of the downlink referencesignal, and outputs the estimation value to the demultiplexing portion1055.

The transmission unit 107 generates an uplink reference signal inresponse to the control signal which is input from the control unit 103,codes and modulates uplink data (transport block) which is input fromthe higher layer processing unit 101, multiplexes the PUCCH, the PUSCH,and the generated uplink reference signal, and transmits the obtainedresult to the base station apparatus 3 via the transmit and receiveantenna 109.

The coding portion 1071 performs coding such as convolutional coding orblock coding on the uplink control information which is input from thehigher layer processing unit 101. In addition, the coding portion 1071performs turbo coding on the basis of information used for schedulingthe PUSCH.

The modulation portion 1073 modulates the coded bits which are inputfrom the coding portion 1071 using a modulation method such as BPSK,QPSK, 16 QAM, or 64 QAM, of which a notification is sent with thedownlink control information, or through a modulation method which ispredefined for each channel. The modulation portion 1073 determines thenumber of data sequences which are spatially multiplexed on the basis ofthe information used for scheduling the PUSCH, maps a plurality ofuplink data items which are transmitted in the same PUSCH to a pluralityof sequences by using multiple input multiple output spatialmultiplexing (MIMO SM), and performs precoding on the sequences.

The uplink reference signal generation portion 1079 generates sequencesobtained according to a predefined rule (expression) on the basis of aphysical cell identity (PCI; referred to as a cell ID or the like) foridentifying the base station apparatus 3, a bandwidth in which theuplink reference signal is mapped, cyclic shift of which a notificationhas been sent in an uplink grant, values of parameters for generation ofa DMRS sequence, and the like. In response to the control signal whichis input from the control unit 103, the multiplexing portion 1075arranges modulation symbols of the PUSCH in parallel, and performsdiscrete Fourier transform (DFT) thereon. In addition, the multiplexingportion 1075 multiplexes signals of the PUCCH and the PUSCH, and thegenerated uplink reference signal for each transmit antenna port. Inother words, the multiplexing portion 1075 maps the signals of the PUCCHand the PUSCH and the generated uplink reference signal in resourceelements for each transmit antenna port.

The radio transmission portion 1077 performs inverse fast Fouriertransform (IFFT) on the multiplexed signal so as to perform modulationthereon through an SC-FDMA method; adds a guard interval to a SC-FDMAsymbol which is SC-FDMA-modulated, so as to generate a digital signalwith a base band; converts the digital signal with the base band into ananalog signal; generates an in-phase component and an orthogonalcomponent with an intermediate frequency from the analog signal; removesa remaining frequency component for an intermediate frequency band;converts (up-converts) the signal with the intermediate frequency into asignal with a radio frequency; removes a remaining frequency componenttherefrom; amplifies power of the signal; and outputs the signal to thetransmit and receive antenna 109 so that the signal is transmitted.

FIG. 25 is a schematic block diagram illustrating a configuration of thebase station apparatus 3 of the present embodiment. As illustrated inFIG. 25, the base station apparatus 3 includes a higher layer processingunit 301, a control unit 303, a reception unit 305, a transmission unit307, and a transmit and receive antenna 309. In addition, the higherlayer processing unit 301 includes a radio resource control portion3011, a subframe setting portion 3013, a scheduling portion 3015, and aCSI transmission timing determination portion 3017. Further, thereception unit 305 includes a decoding portion 3051, a demodulationportion 3053, a demultiplexing portion 3055, a radio reception portion3057, and a channel measurement portion 3059. Furthermore, thetransmission unit 307 includes a coding portion 3071, a modulationportion 3073, a multiplexing portion 3075, a radio transmission portion3077, and a downlink reference signal generation portion 3079.

The higher layer processing unit 301 performs processes on a mediumaccess control (MAC) layer, a packet data convergence protocol (PDCP)layer, a radio link control (RLC) layer, and a radio resource control(RRC) layer. In addition, the higher layer processing unit 301 generatescontrol information for controlling the reception unit 305 and thetransmission unit 307 and transmits the control information to thecontrol unit 303.

The radio resource control portion 3011 of the higher layer processingunit 301 generates downlink data (transport block) which will be mappedin the PDSCH of a downlink, system information, an RRC message, a MACcontrol element (CE), and the like, or acquires the information from ahigher node, and outputs the information to the transmission unit 307.In addition, the radio resource control portion 3011 manages variousitems of configuration information of each of the mobile stationapparatuses 1.

The subframe setting portion 3013 of the higher layer processing unit301 performs, on each of the mobile station apparatuses 1, management ofthe first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, the second uplink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration.

The subframe setting portion 3013 sets, in each of the mobile stationapparatuses 1, the first uplink reference UL-DL configuration, the firstdownlink reference UL-DL configuration, the second uplink referenceUL-DL configuration, the second downlink reference UL-DL configuration,and the transmission direction UL-DL configuration.

The subframe setting portion 3013 generates first information indicatingthe first uplink reference UL-DL configuration, second informationindicating the first downlink reference UL-DL configuration, and thirdinformation indicating the transmission direction UL-DL configuration.The subframe setting portion 3013 transmits the first information, thesecond information, and the third information to the mobile stationapparatus 1 via the transmission unit 307.

The base station apparatus 3 determines the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration for the mobile station apparatus 1. In addition, the basestation apparatus 3 may be given an instruction for the first uplinkreference UL-DL configuration, the first downlink reference UL-DLconfiguration, the second uplink reference UL-DL configuration, thesecond downlink reference UL-DL configuration, and/or the transmissiondirection UL-DL configuration, related to the mobile station apparatus1, from a higher node.

For example, the subframe setting portion 3013 may determine the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, the second uplink reference UL-DL configuration, thesecond downlink reference UL-DL configuration, and/or the transmissiondirection UL-DL configuration on the basis of an uplink traffic amountand a downlink traffic amount.

The scheduling portion 3015 of the higher layer processing unit 301determines a frequency and a subframe in which physical channels (thePDSCH and the PUSCH) are assigned, a coding rate of the physicalchannels (the PDSCH and the PUSCH), a modulation method, transmissionpower, and the like, on the basis of a channel estimation value, channelquality, or the like which is input from the channel measurement portion3059. The scheduling portion 3015 determines whether a downlink physicalchannel and/or a downlink physical signal (are) is scheduled or anuplink physical channel and/or an uplink physical signal (are) isscheduled, in a flexible subframe. The scheduling portion 3015 generatescontrol information (for example, a DCI format) for controlling thereception unit 305 and the transmission unit 307 on the basis of thescheduling result, and outputs the control information to the controlunit 303.

The scheduling portion 3015 generates information used for schedulingthe physical channels (the PDSCH and the PUSCH) on the basis of thescheduling result. The scheduling portion 3015 determines timings forperforming a transmission process and a reception process on the basisof the first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, the second uplink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, and/orthe transmission direction UL-DL configuration.

The CSI transmission timing determination portion 3017 specifies(selects, determines) a periodicity and/or a timing offset at which themobile station apparatus 1 transmits the periodic CSI. The CSItransmission timing determination portion 3017 transmits an indexindicating the specified periodicity and/or timing offset to the mobilestation apparatus 1 as an RRC parameter via the transmission unit 307.

The CSI transmission timing determination portion 3017 may restrict asubframe in which the mobile station apparatus 1 transmits the periodicCSI on the basis of the first downlink reference UL-DL configurationwhich is determined by the subframe setting portion 3013. In addition,the CSI transmission timing determination portion 3017 may restrict aperiodicity and/or a timing offset in which the mobile station apparatus1 transmits the periodic CSI on the basis of the first downlinkreference UL-DL configuration which is determined by the subframesetting portion 3013.

The control unit 303 generates control signals for controlling thereception unit 305 and the transmission unit 307 on the basis of thecontrol information from the higher layer processing unit 301. Thecontrol unit 303 outputs the generated control signals to the receptionunit 305 and the transmission unit 307 so as to control the receptionunit 305 and the transmission unit 307.

The reception unit 305 demultiplexes, demodulates and decodes a receivedsignal which is received from the mobile station apparatus 1 via thetransmit and receive antenna 309, in response to the control signalwhich is input from the control unit 303, and outputs the decodedinformation to the higher layer processing unit 301. The radio receptionportion 3057 converts (down-converts) an uplink signal which is receivedvia the transmit and receive antenna 309 into an intermediate frequencyso as to remove unnecessary frequency components, controls anamplification level so that a signal level is appropriately maintained,orthogonally demodulates the received signal on the basis of an in-phasecomponent and an orthogonal component thereof, and converts theorthogonally demodulated analog signal into a digital signal.

The radio reception portion 3057 removes a portion corresponding to aguard interval (GI) from the converted digital signal. The radioreception portion 3057 performs fast Fourier transform (FFT) on thesignal from which the guard interval is removed, so as to extract asignal of the frequency domain which is thus output to thedemultiplexing portion 3055.

The demultiplexing portion 1055 demultiplexes the signal which is inputfrom the radio reception portion 3057, into signals such as the PUCCH,the PUSCH, and the uplink reference signal. In addition, thisdemultiplexing is performed on the basis of radio resource assignmentinformation which is determined in advance by the radio resource controlportion 3011 and is included in an uplink grant of which the basestation apparatus 3 notifies to each mobile station apparatus 1.Further, the demultiplexing portion 3055 compensates channels such asthe PUCCH and the PUSCH on the basis of channel estimation values whichare input from the channel measurement portion 3059. Furthermore, thedemultiplexing portion 3055 outputs the demultiplexed uplink referencesignal to the channel measurement portion 3059.

The demodulation portion 3053 performs inverse discrete Fouriertransform (IDFT) on the PUSCH so as to acquire modulation symbols, andperforms demodulation of the received signal on each of the modulationsymbols of the PUCCH and the PUSCH, by using a modulation method whichis predefined, such as binary phase shift keying (BPSK), QPSK, 16 QAM,or 64 QAM, or a modulation method of which the base station apparatus 3notifies the mobile station apparatus 1 in advance in an uplink grant.The demodulation portion 3053 demultiplexes modulation symbols of aplurality of uplink data items transmitted in the same PUSCH by usingthe MIMO SM on the basis of the number of spatially multiplexedsequences of which a notification is sent to each mobile stationapparatus 1 in advance in the uplink grant and information for giving aninstruction for precoding which will be performed on the sequences.

The decoding portion 3051 decodes coded bits of the demodulated PUCCHand PUSCH at a coding rate which is predefined in a predefined codingmethod or of which the base station apparatus 3 notifies the mobilestation apparatus 1 in the uplink grant in advance, and outputs decodeduplink data and uplink control information to the higher layerprocessing unit 101. In a case where the PUSCH is retransmitted, thedecoding portion 3051 performs decoding by using coded bits which areinput from the higher layer processing unit 301 and are stored in a HARQbuffer and the demodulated coded bits. The channel measurement portion3059 measures channel estimation values, quality of the channels, andthe like on the basis of the uplink reference signal which is input fromthe demultiplexing portion 3055, and outputs the measured results to thedemultiplexing portion 3055 and the higher layer processing unit 301.

The transmission unit 307 generates a downlink reference signal inresponse to the control signal which is input from the control unit 303,codes and modulates the HARQ indicator, the downlink control signal, andthe downlink data which are input from the higher layer processing unit301, multiplexes the PHICH, the PDCCH, the EPDCCH, the PDSCH, and thedownlink reference signal, and transmits a signal to the mobile stationapparatus 1 via the transmit and receive antenna 309.

The coding portion 3071 performs coding on the HARQ indicator, thedownlink control information, and the downlink data which are input fromthe higher layer processing unit 301, by using a predefined codingmethod such as block coding, convolutional coding, or turbo coding, orby using a coding method determined by the radio resource controlportion 3011. The modulation portion 3073 modulates the coded bits whichare input from the coding portion 3071 by using a predefined modulationmethod such as BPSK, QPSK, 16 QAM, or 64 QAM, or by using a modulationmethod determined by the radio resource control portion 3011.

The downlink reference signal generation portion 3079 generatessequences which are obtained using a predefined rule and are known tothe mobile station apparatus 1, as the downlink reference signal, on thebasis of a physical cell identity (PCI) or the like for identifying thebase station apparatus 3. The multiplexing portion 3075 multiplexes themodulation symbol of each modulated channel and the generated downlinkreference signal. In other words, the multiplexing portion 3075 maps themodulation symbol of each modulated channel and the generated downlinkreference signal in resource elements.

The radio transmission portion 3077 performs inverse fast Fouriertransform (IFFT) on the multiplexed modulation symbol so as to performmodulation thereon through an OFDM method; adds a guard interval to anOFDM symbol which is OFDM-modulated, so as to generate a digital signalwith a base band; converts the digital signal with the base band into ananalog signal; generates an in-phase component and an orthogonalcomponent with an intermediate frequency from the analog signal; removesa remaining frequency component from an intermediate frequency band;converts (up-converts) the signal with the intermediate frequency into asignal with a radio frequency (RF); removes a remaining frequencycomponent therefrom; amplifies power of the signal; and outputs thesignal to the transmit and receive antenna 309 so that the signal istransmitted.

As mentioned above, in the present embodiment, a reporting periodicityand/or a timing offset of the periodic CSI is restricted on the basis ofthe set first downlink reference UL-DL configuration, and thus it ispossible to prevent conflict from occurring when the mobile stationapparatus 1 in which the dynamic TDD is configured transmits theperiodic CSI at a timing at which the base station apparatus 3 transmitsa downlink signal.

In addition, only the periodic CSI has been described in the abovemethod, but the method may be applied to other pieces of information aslong as the information can be periodically transmitted. For example,the method may be applied to a scheduling request (SR) indicating arequest for a PUSCH resource.

A subframe used to transmit the SR is specified (selected, determined)on the basis of the following Equation 3.

(10×n _(f) +└n _(s)/2┘−N _(OFFSET,SR))mod(SR _(PERIODICITY))=0  [Math 3]

Here, n_(f) indicates a system frame number, and n_(s) indicates a slotnumber in a system frame. In addition, N_(OFFSET,SR) indicates atransmission timing offset of the SR, and SR_(PERIODICITY) indicates aperiodicity of a subframe in which the SR can be transmitted, both ofwhich are respectively set through signaling of a high layer on thebasis of a table illustrated in FIG. 26. In FIG. 26, I_(SR) is aparameter of which a notification is sent from a high layer, and themobile station apparatus 1 having received the notification of theparameter specifies (selects, determines) SR_(PERIODICITY) andN_(OFFSET,SR) by using the table shown in FIG. 26.

Hereinafter, a description will be made of a case where a periodicity ofa subframe in which the SR can be transmitted on the basis of the firstdownlink reference UL-DL configuration. FIG. 27 illustratesconfigurations of a downlink subframe, a special subframe, and an uplinksubframe in the first downlink reference UL-DL configuration, andsupported periodicities of a subframe in which the SR can be transmittedin the configuration. In the present embodiment, the mobile stationapparatus 1 can report the periodic CSI only in the uplink subframehatched in FIG. 22. Thus, a periodicity of a subframe in which the SRcan be transmitted is restricted as follows on the basis of the firstdownlink reference UL-DL configuration.

(1) SR_(PERIODICITY)=1 can be set only in a case where the firstdownlink reference UL-DL configurations are 0, 1, 3, 4 and 6, and the SRcan be transmitted in a case where a subframe is an uplink subframeindicated by the first downlink reference UL-DL configuration.

(2) SR_(PERIODICITY)=2 can be set only in a case where the firstdownlink reference UL-DL configurations are 0, 3 and 6, and the SR canbe transmitted in a case where a subframe for each periodicity is anuplink subframe indicated by the first downlink reference UL-DLconfiguration. However, in a case where the first downlink referenceUL-DL configuration is 3, the reporting periodicity may be set only whenthe timing offset N_(OFFSET,SR) is 0.

(3) SR_(PERIODICITY)=5 can be set only in a case where the firstdownlink reference UL-DL configurations are 0, 1, 2 and 6. However, in acase where the first downlink reference UL-DL configuration is 6, thereporting periodicity may be set only when the timing offsetN_(OFFSET,SR) is 2 or 3.

(4) SR_(PERIODICITY)=10, 20, 40, and 80 can be set by all of the firstdownlink reference UL-DL configurations.

In addition, even a periodicity supported on the basis of the firstdownlink reference UL-DL configuration may be excluded in a case where asubframe designated by the timing offset N_(OFFSET,SR) is a downlinksubframe indicated by the first downlink reference UL-DL configurationat all times.

In the same manner as in the case of the periodic CSI, predeterminederror handling may be performed in a case where a periodicity and/or atiming offset of a subframe in which the SR can be transmitted, of whicha notification is sent via a high layer are (is) not an applicablevalue. Further, the predetermined error handling may be performed in thehigh layer.

In addition, in a case where the second information has been received,the mobile station apparatus 1 restricts a periodicity and/or a timingoff of a subframe in which the SR can be transmitted, on the basis ofthe first downlink reference UL-DL configuration which is set on thebasis of the second information. In a case where the second informationhas not been received, the mobile station apparatus 1 restricts aperiodicity and/or a timing offset of a subframe in which the SR can betransmitted, on the basis of the first downlink reference UL-DLconfiguration which is set on the basis of the first information. Thiswill be described in detail with reference to a flowchart illustrated inFIG. 28. The mobile station apparatus 1 determines whether or not thesecond information for a primary cell has been received (S1500). If thesecond information for the primary cell has been received, the mobilestation apparatus 1 sets the first downlink reference UL-DLconfiguration for the primary cell on the basis of the secondinformation for the primary cell (S1501). If the second information forthe primary cell has not been received (else/otherwise), the mobilestation apparatus 1 sets the first downlink reference UL-DLconfiguration for the primary cell on the basis of the first informationfor the primary cell (S1502). The mobile station apparatus 1 restricts areporting periodicity and/or a timing offset of a subframe in which theSR can be transmitted, on the basis of the first downlink referenceUL-DL configuration for the primary cell which is set in S1501 or S1502(S1503).

However, the method is described on the premise that the mobile stationapparatus 1 transmits the SR via the PUCCH only in a primary cell,however, another method is employed in a case where the mobile stationapparatus 1 transmits the SR via the PUCCH in a secondary cell. Forexample, the mobile station apparatus 1 may receive the secondinformation for a secondary cell, set the first downlink reference UL-DLconfiguration for the secondary cell on the basis of the secondinformation, and restrict a reporting periodicity and/or a timing offsetof a subframe in which the SR can be transmitted in the secondary cellon the basis of the first downlink reference UL-DL configuration for thesecondary cell. For example, the mobile station apparatus 1 may restricta reporting periodicity and/or a timing offset of the SR which istransmitted in the primary cell and/or the secondary cell on the basisof the first downlink reference UL-DL configuration for the primary celland the first downlink reference UL-DL configuration for the secondarycell.

As mentioned above, a periodicity and/or a timing offset of a subframein which the SR can be transmitted is restricted on the basis of the setfirst downlink reference UL-DL configuration, and thus it is possible toprevent conflict from occurring when the mobile station apparatus 1 inwhich the dynamic TDD is configured transmits the SR at a timing atwhich the base station apparatus 3 transmits a downlink signal.

(i) A mobile station apparatus 1 of the present embodiment performsperiodic channel state information reporting to a base station apparatus3, and the mobile station apparatus 1 includes a reception unit 105 thatreceives first information, second information, and index information(I_(CQI/PMI)) indicating a value (N_(pd)) of reporting periodicity ofthe channel state information, from the base station apparatus 3; and aCSI transmission control portion 1017 that determines the value (N_(pd))of reporting periodicity of the channel state information on the basisof the index information (I_(CQI/PMI)), in which the applicable value(N_(pd)) is based on a certain UL-DL configuration, in which, in a casewhere the second information is not configured, the certain UL-DLconfiguration is a UL-DL configuration indicated by the firstinformation, and in which, in a case where the second information isconfigured, the certain UL-DL configuration is a UL-DL configurationindicated by the second information.

(ii) The reception unit 105 of the mobile station apparatus 1 receivesthird information, and a UL-DL configuration indicated by the thirdinformation is used for the channel state information measurement.

(iii) In the mobile station apparatus 1 of the present embodiment, eachof the first information and the second information corresponds to aprimary cell.

(iv) In the mobile station apparatus 1 of the present embodiment, in acase where the second information is configured, a scheduling timing ofa physical uplink shared channel is set according to a UL-DLconfiguration indicated by the first information, and a downlink HARQtiming is set according to a UL-DL configuration indicated by the secondinformation.

(v) In the mobile station apparatus 1 of the present embodiment, in acase where the second information is configured, uplink schedulingtiming and downlink HARQ timing are set according to a UL-DLconfiguration indicated by the first information.

(vi) In the mobile station apparatus 1 of the present embodiment, theindex information (I_(CQI/PMI)) indicates an offset value(N_(OFFSET,CQI)) for the channel state information reporting.

(vii) A base station apparatus 3 receives periodic channel stateinformation reporting from a mobile station apparatus 1, and the basestation apparatus 3 includes a CSI transmission timing determinationportion 3017 that generates index information (I_(CQI/PMI)) indicating avalue (N_(pd)) for reporting periodicity of the channel stateinformation; and a transmission unit 307 that transmits firstinformation, second information, and the index information (I_(CQI/PMI))to the mobile station apparatus 1, in which the applicable value(N_(pd)) is based on a certain UL-DL configuration, in which, in a casewhere the second information is configured, scheduling timing of aphysical uplink shared channel is set according to a UL-DL configurationindicated by the first information, downlink HARQ timing is configuredaccording to a UL-DL configuration indicated by the second information,and the certain UL-DL configuration which is the UL-DL configurationindicated by the second information.

(viii) In base station apparatus 3 of the present embodiment, in a casewhere the second information is configured, uplink scheduling timing anddownlink HARQ timing are set according to a UL-DL configurationindicated by the first information, and the certain UL-DL configurationis the UL-DL configuration is indicated by the first information.

(ix) The transmission unit 307 of the base station apparatus transmitsthird information, and a UL-DL configuration indicated by the thirdinformation is used for the channel state information measurement.

(x) In the base station apparatus 3 of the present embodiment, each ofthe first information and the second information corresponds to aprimary cell.

(xi) The index information (I_(CQI/PMI)) generated by the CSItransmission timing determination portion 3017 of the base stationapparatus 3 of the present embodiment indicates an offset value(N_(OFFSET,CQI)) for the channel state information reporting.

In addition, in the above-described embodiment, the mobile stationapparatus 1 may include a subframe setting portion 1013 that specifies afirst uplink reference UL-DL configuration and a first downlinkreference UL-DL configuration on the basis of information of which anotification is sent from the base station apparatus 3; and a CSItransmission control portion 1017 that specifies a value (N_(pd)) forreporting periodicity of a subframe for reporting the channel stateinformation to the base station apparatus 3 on the basis of the indexinformation (I_(CQI/PMI)) indicating the value (N_(pd)) for reportingperiodicity of the channel state information, of which a notification issent from the base station apparatus 3, and information indicating thevalue (N_(pd)) for reporting periodicity of the channel stateinformation, supported by the first downlink reference UL-DLconfiguration.

Further, in the above-described embodiment, the mobile station apparatus1 may include a subframe setting portion 1013 that specifies a firstuplink reference UL-DL configuration on the basis of first informationof which a notification is sent from the base station apparatus 3 andspecifies a first downlink reference UL-DL configuration on the basis ofsecond information of which a notification is sent from the base stationapparatus 3 or the first information; and a CSI transmission controlportion 1017 that specifies a supported value (N_(pd)) for reportingperiodicity of the channel state information on the basis of the firstinformation in a case where the first downlink reference UL-DLconfiguration is specified on the basis of the first information,specifies a supported value (N_(pd)) for reporting periodicity of thechannel state information on the basis of the second information in acase where the first downlink reference UL-DL configuration is specifiedon the basis of the second information, and specifies a value (N_(pd))for reporting periodicity of a subframe for reporting the channel stateinformation to the base station apparatus 3 on the basis of indexinformation (I_(CQI/PMI)) indicating the value (N_(pd)) for reportingperiodicity of the channel state information, of which a notification issent from the base station apparatus 3, and information indicating thesupported value (N_(pd)) for reporting periodicity of the channel stateinformation.

In addition, in the above-described embodiment, the mobile stationapparatus 1 and the base station apparatus 3 specify the first downlinkreference UL-DL configuration on the basis of the first information in acase where the first downlink reference UL-DL configuration is notspecified on the basis of the second information, but may specify aUL-DL configuration of a predetermined serving cell on the basis of thefirst information. As a value (N_(pd)) for reporting periodicity of thechannel state information, an applicable value may be defined on thebasis of the UL-DL configuration of the predetermined serving cell.Here, the predetermined serving cell may be a primary cell, and may be aserving cell corresponding to the periodic channel state information. Inother words, the first downlink reference UL-DL configuration specifiedon the basis of the first information may also be referred to as a UL-DLconfiguration of a serving cell.

A program which runs in the base station apparatus 3 and the mobilestation apparatus 1 according to the present invention is a program(which causes a computer to function) which controls a centralprocessing unit (CPU) and the like so as to realize the functions of theembodiments according to the present invention. In addition, theinformation treated in these devices is temporarily accumulated in arandom access memory (RAM) during the processing thereof, is then storedin various ROMs such as a flash read only memory (ROM) or hard diskdrives (HDDs), and is read by the CPU as necessary so as to be correctedand be written.

In addition, part of the mobile station apparatus 1 and the base stationapparatus 3 in the above-described embodiments may be realized by acomputer. In this case, a program for realizing the control function isrecorded on a computer readable recording medium, and the controlfunction may be realized by a computer system reading and executing theprogram recorded on the recording medium.

In addition, the “computer system” mentioned here is a computer systemwhich is built into the mobile station apparatus 1 or the base stationapparatus 3, and includes hardware such as an OS or peripheral devices.Further, the “computer readable recording medium” refers to a portablemedium such as a flexible disk, a magneto-optical disc, a ROM, or aCD-ROM, and a storage device such as a hard disk built into the computersystem.

Furthermore, the “computer readable recording medium” may also includeone which dynamically holds a program for a short period of time, suchas a communication line in a case where the program is transmitted via anetwork such as the Internet or a communication line such as a telephoneline, and one which holds the program for a specific time, such as anonvolatile memory of the computer system which becomes a server or aclient in this case. Moreover, the program may be one which realizessome of the above-described functions, and may be one which realizes theabove-described functions in combination with a program which hasalready been recorded in the computer system.

In addition, the base station apparatus 3 of the above-describedembodiments may be realized as an aggregate (device groups) constitutedby a plurality of devices. Each of the devices constituting the devicegroup may include each function, or some or all of the functional blocksof the base station apparatus 3 according to the embodiments. The devicegroup may have each general function or each general functional block ofthe base station apparatus 3. Further, the mobile station apparatus 1according to the above-described embodiments may communicate with thebase station apparatus as an aggregate.

In addition, the base station apparatus 3 in the above-describedembodiments may be an evolved universal terrestrial radio access network(EUTRAN). Further, the base station apparatus 3 in the above-describedembodiments may have some or all of the functions of the higher node ofeNodeB.

Further, part or the whole of the mobile station apparatus 1 and thebase station apparatus 3 in the above-described embodiments may betypically implemented by an LSI which is an integrated circuit, and maybe realized by a chip set. The respective functional blocks of themobile station apparatus 1 and the base station apparatus 3 may beseparately formed of a chip, and some or all of the blocks may beintegrally formed as a chip. Further, a technique for an integratedcircuit is not limited to an LSI, and may be realized by a dedicatedcircuit or a general purpose processor. Furthermore, in a case where atechnique for an integrated circuit replacing the LSI appears with theadvance of a semiconductor technique, an integrated circuit based on thetechnique may be used.

In addition, in the above-described embodiments, a mobile stationapparatus has been described as an example of a terminal apparatus or acommunication apparatus, but the present invention is not limitedthereto, and is applicable to terminal apparatuses or communicationapparatuses, such as non-movable or stationary electronic apparatusesinstalled indoors or outdoors, for example, AV apparatuses, kitchenapparatuses, cleaning and washing apparatuses, air-conditioningapparatuses, vending machines, and other pieces of household equipment.

As mentioned above, although the embodiments of the present inventionhave been described in detail with reference to the drawings, a specificconfiguration is not limited to the embodiments, and designmodifications and the like may occur within the scope without departingfrom the spirit of the invention. In addition, various alterations mayoccur in the claims of the present invention, and embodiments obtainedby appropriately combining technical means which are respectivelydisclosed in different embodiments are also included in the technicalscope of the present invention. Further, configurations in which theelements which are disclosed in the above-described respectiveembodiments and achieve the same effect are replaced with each other arealso included in the technical scope of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

-   -   1 (1A, 1B, 1C) MOBILE STATION APPARATUS    -   3 BASE STATION APPARATUS    -   101 HIGHER LAYER PROCESSING UNIT    -   103 CONTROL UNIT    -   105 RECEPTION UNIT    -   107 TRANSMISSION UNIT    -   301 HIGHER LAYER PROCESSING UNIT    -   303 CONTROL UNIT    -   305 RECEPTION UNIT    -   307 TRANSMISSION UNIT    -   1011 RADIO RESOURCE CONTROL PORTION    -   1013 SUBFRAME SETTING PORTION    -   1015 SCHEDULING INFORMATION ANALYSIS PORTION    -   1017 CSI transmission control portion    -   1051 DECODING PORTION    -   1053 DEMODULATION PORTION    -   1055 DEMULTIPLEXING PORTION    -   1057 RADIO RECEPTION PORTION    -   1059 CHANNEL MEASUREMENT PORTION    -   1071 CODING PORTION    -   1073 MODULATION PORTION    -   1075 MULTIPLEXING PORTION    -   1077 RADIO TRANSMISSION PORTION    -   1079 UPLINK REFERENCE SIGNAL GENERATION PORTION    -   3011 RADIO RESOURCE CONTROL PORTION    -   3013 SUBFRAME SETTING PORTION    -   3015 SCHEDULING PORTION    -   3017 CSI TRANSMISSION TIMING DETERMINATION PORTION    -   3051 DECODING PORTION    -   3053 DEMODULATION PORTION    -   3055 DEMULTIPLEXING PORTION    -   3057 RADIO RECEPTION PORTION    -   3059 CHANNEL MEASUREMENT PORTION    -   3071 CODING PORTION    -   3073 MODULATION PORTION    -   3075 MULTIPLEXING PORTION    -   3077 RADIO TRANSMISSION PORTION    -   3079 DOWNLINK REFERENCE SIGNAL GENERATION PORTION

1. A terminal apparatus comprising: a receiver configured to and/orprogrammed to receive first information, second information, and indexinformation indicating a periodicity value for the channel stateinformation reporting, from the base station apparatus; and atransmission control circuit configured to and/or programmed to performperiodic channel state information reporting to a base stationapparatus, wherein applicable values for the periodicity value aredepending on a UL-DL configuration, in a case where the secondinformation is configured, the UL-DL configuration is a first UL-DLconfiguration which is indicated by the second information, and in acase where the second information is not configured, the UL-DLconfiguration is a second UL-DL configuration which is indicated by thefirst information.
 2. The terminal apparatus according to claim 1,wherein a first periodicity value is included in the applicable valuesin a case that the UL-DL configuration belongs to {0, 1, 3, 4, 6}, asecond periodicity value different from the first periodicity value isincluded in the applicable values in a case that the UL-DL configurationbelongs to {0, 1, 2, 6}, and third periodicity values different from thefirst periodicity value and the second periodicity value are included inthe applicable values for any of the UL-DL configuration.
 3. Theterminal apparatus according to claim 1, wherein the receiver isconfigured to and/or programmed to receive third information, and athird UL-DL configuration indicated by the third information is used forchannel state information measurement.
 4. The terminal apparatusaccording to claim 1, wherein each of the first information and thesecond information corresponds to a primary cell.
 5. The terminalapparatus according to claim 1, wherein in a case where the secondinformation is configured, a scheduling timing of a physical uplinkshared channel is set according to the second UL-DL configuration, and adownlink HARQ timing is set according to the first UL-DL configuration.6. The terminal apparatus according to claim 1, wherein in a case wherethe second information is not configured, an uplink scheduling timingand a downlink HARQ timing are set according to the second UL-DLconfiguration.
 7. The terminal apparatus according to claim 1, whereinthe index information indicates an offset value for the channel stateinformation reporting.